Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibGUI/GFontDatabase.cpp

@@ -0,0 +1,62 @@
+#include <LibCore/CDirIterator.h>
+#include <LibGUI/GFontDatabase.h>
+#include <SharedGraphics/Font.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static GFontDatabase* s_the;
+
+GFontDatabase& GFontDatabase::the()
+{
+    if (!s_the)
+        s_the = new GFontDatabase;
+    return *s_the;
+}
+
+GFontDatabase::GFontDatabase()
+{
+    CDirIterator di("/res/fonts", CDirIterator::SkipDots);
+    if (di.has_error()) {
+        fprintf(stderr, "CDirIterator: %s\n", di.error_string());
+        exit(1);
+    }
+    while (di.has_next()) {
+        String name = di.next_path();
+        auto path = String::format("/res/fonts/%s", name.characters());
+        if (auto font = Font::load_from_file(path)) {
+            Metadata metadata;
+            metadata.path = path;
+            metadata.glyph_height = font->glyph_height();
+            metadata.is_fixed_width = font->is_fixed_width();
+            m_name_to_metadata.set(font->name(), move(metadata));
+        }
+    }
+}
+
+GFontDatabase::~GFontDatabase()
+{
+}
+
+void GFontDatabase::for_each_font(Function<void(const StringView&)> callback)
+{
+    for (auto& it : m_name_to_metadata) {
+        callback(it.key);
+    }
+}
+
+void GFontDatabase::for_each_fixed_width_font(Function<void(const StringView&)> callback)
+{
+    for (auto& it : m_name_to_metadata) {
+        if (it.value.is_fixed_width)
+            callback(it.key);
+    }
+}
+
+RefPtr<Font> GFontDatabase::get_by_name(const StringView& name)
+{
+    auto it = m_name_to_metadata.find(name);
+    if (it == m_name_to_metadata.end())
+        return nullptr;
+    return Font::load_from_file((*it).value.path);
+}