LibCore: Put all classes in the Core namespace and remove the leading C

I've been wanting to do this for a long time. It's time we start being
consistent about how this stuff works.

The new convention is:

- "LibFoo" is a userspace library that provides the "Foo" namespace.

That's it :^) This was pretty tedious to convert and I didn't even
start on LibGUI yet. But it's coming up next.

DevTools/HackStudio/Editor.cpp

@@ -67,7 +67,7 @@ const EditorWrapper& Editor::wrapper() const
     return static_cast<const EditorWrapper&>(*parent());
 }
 
-void Editor::focusin_event(CEvent& event)
+void Editor::focusin_event(Core::Event& event)
 {
     wrapper().set_editor_has_focus({}, true);
     if (on_focus)
@@ -75,7 +75,7 @@ void Editor::focusin_event(CEvent& event)
     GTextEditor::focusin_event(event);
 }
 
-void Editor::focusout_event(CEvent& event)
+void Editor::focusout_event(Core::Event& event)
 {
     wrapper().set_editor_has_focus({}, false);
     GTextEditor::focusout_event(event);
@@ -103,7 +103,7 @@ static HashMap<String, String>& man_paths()
     static HashMap<String, String> paths;
     if (paths.is_empty()) {
         // FIXME: This should also search man3, possibly other places..
-        CDirIterator it("/usr/share/man/man2", CDirIterator::Flags::SkipDots);
+        Core::DirIterator it("/usr/share/man/man2", Core::DirIterator::Flags::SkipDots);
         while (it.has_next()) {
             auto path = String::format("/usr/share/man/man2/%s", it.next_path().characters());
             auto title = FileSystemPath(path).title();
@@ -132,8 +132,8 @@ void Editor::show_documentation_tooltip_if_available(const String& hovered_token
 #ifdef EDITOR_DEBUG
     dbg() << "opening " << it->value;
 #endif
-    auto file = CFile::construct(it->value);
-    if (!file->open(CFile::ReadOnly)) {
+    auto file = Core::File::construct(it->value);
+    if (!file->open(Core::File::ReadOnly)) {
         dbg() << "failed to open " << it->value << " " << file->error_string();
         return;
     }

DevTools/HackStudio/Editor.h

@@ -44,8 +44,8 @@ public:
     void notify_did_rehighlight();
 
 private:
-    virtual void focusin_event(CEvent&) override;
-    virtual void focusout_event(CEvent&) override;
+    virtual void focusin_event(Core::Event&) override;
+    virtual void focusout_event(Core::Event&) override;
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousemove_event(GMouseEvent&) override;
     virtual void cursor_did_change() override;

DevTools/HackStudio/EditorWrapper.h

@@ -52,7 +52,7 @@ private:
 };
 
 template<>
-inline bool is<EditorWrapper>(const CObject& object)
+inline bool Core::is<EditorWrapper>(const Core::Object& object)
 {
     return !strcmp(object.class_name(), "EditorWrapper");
 }

DevTools/HackStudio/ProcessStateWidget.cpp

@@ -57,7 +57,7 @@ ProcessStateWidget::ProcessStateWidget(GWidget* parent)
     memory_label_label->set_font(Font::default_bold_font());
     m_memory_label = GLabel::construct("", this);
 
-    m_timer = CTimer::construct(500, [this] {
+    m_timer = Core::Timer::construct(500, [this] {
         refresh();
     });
 }
@@ -70,7 +70,7 @@ void ProcessStateWidget::refresh()
 {
     pid_t pid = tcgetpgrp(m_tty_fd);
 
-    auto processes = CProcessStatisticsReader::get_all();
+    auto processes = Core::ProcessStatisticsReader::get_all();
     auto child_process_data = processes.get(pid);
 
     if (!child_process_data.has_value())

DevTools/HackStudio/ProcessStateWidget.h

@@ -28,7 +28,10 @@
 
 #include <LibGUI/GWidget.h>
 
-class CTimer;
+namespace Core {
+class Timer;
+}
+
 class GLabel;
 
 class ProcessStateWidget final : public GWidget {
@@ -48,7 +51,7 @@ private:
     RefPtr<GLabel> m_cpu_label;
     RefPtr<GLabel> m_memory_label;
 
-    RefPtr<CTimer> m_timer;
+    RefPtr<Core::Timer> m_timer;
 
     int m_tty_fd { -1 };
 };

DevTools/HackStudio/Project.cpp

@@ -190,8 +190,8 @@ Project::~Project()
 
 OwnPtr<Project> Project::load_from_file(const String& path)
 {
-    auto file = CFile::construct(path);
-    if (!file->open(CFile::ReadOnly))
+    auto file = Core::File::construct(path);
+    if (!file->open(Core::File::ReadOnly))
         return nullptr;
 
     Vector<String> files;
@@ -225,12 +225,12 @@ bool Project::remove_file(const String& filename)
 
 bool Project::save()
 {
-    auto project_file = CFile::construct(m_path);
-    if (!project_file->open(CFile::WriteOnly))
+    auto project_file = Core::File::construct(m_path);
+    if (!project_file->open(Core::File::WriteOnly))
         return false;
 
     for (auto& file : m_files) {
-        // FIXME: Check for error here. CIODevice::printf() needs some work on error reporting.
+        // FIXME: Check for error here. IODevice::printf() needs some work on error reporting.
         project_file->printf("%s\n", file.name().characters());
     }
 

DevTools/HackStudio/ProjectFile.cpp

@@ -32,8 +32,8 @@ const GTextDocument& ProjectFile::document() const
 {
     if (!m_document) {
         m_document = GTextDocument::create(nullptr);
-        auto file = CFile::construct(m_name);
-        if (!file->open(CFile::ReadOnly)) {
+        auto file = Core::File::construct(m_name);
+        if (!file->open(Core::File::ReadOnly)) {
             ASSERT_NOT_REACHED();
         }
         m_document->set_text(file->read_all());

DevTools/HackStudio/TerminalWrapper.cpp

@@ -163,7 +163,7 @@ TerminalWrapper::TerminalWrapper(GWidget* parent)
 {
     set_layout(make<GVBoxLayout>());
 
-    RefPtr<CConfigFile> config = CConfigFile::get_for_app("Terminal");
+    RefPtr<Core::ConfigFile> config = Core::ConfigFile::get_for_app("Terminal");
     m_terminal_widget = TerminalWidget::construct(-1, false, config);
     add_child(*m_terminal_widget);
 

DevTools/HackStudio/main.cpp

@@ -180,8 +180,8 @@ int main(int argc, char** argv)
         if (input_box->exec() == GInputBox::ExecCancel)
             return;
         auto filename = input_box->text_value();
-        auto file = CFile::construct(filename);
-        if (!file->open((CIODevice::OpenMode)(CIODevice::WriteOnly | CIODevice::MustBeNew))) {
+        auto file = Core::File::construct(filename);
+        if (!file->open((Core::IODevice::OpenMode)(Core::IODevice::WriteOnly | Core::IODevice::MustBeNew))) {
             GMessageBox::show(String::format("Failed to create '%s'", filename.characters()), "Error", GMessageBox::Type::Error, GMessageBox::InputType::OK, g_window);
             return;
         }