ProcessManager: Start working on a graphical process manager.

I need a table view widget for this thing, so I'm also using this to
prototype a model/view thingy.

Applications/ProcessManager/main.cpp

@@ -0,0 +1,63 @@
+#include <LibGUI/GWindow.h>
+#include <LibGUI/GWidget.h>
+#include <LibGUI/GBoxLayout.h>
+#include <LibGUI/GApplication.h>
+#include <LibGUI/GStatusBar.h>
+#include <LibGUI/GToolBar.h>
+#include <LibGUI/GMenuBar.h>
+#include <LibGUI/GAction.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include "ProcessView.h"
+
+int main(int argc, char** argv)
+{
+    GApplication app(argc, argv);
+
+    auto* widget = new GWidget;
+    widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
+
+    auto* toolbar = new GToolBar(widget);
+    auto* process_view = new ProcessView(widget);
+    auto* statusbar = new GStatusBar(widget);
+    process_view->on_status_message = [statusbar] (String message) {
+        statusbar->set_text(move(message));
+    };
+
+    auto kill_action = GAction::create("Kill process", GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/kill16.rgb", { 16, 16 }), [process_view] (const GAction&) {
+        pid_t pid = process_view->selected_pid();
+        if (pid != -1)
+            kill(pid, SIGKILL);
+    });
+    toolbar->add_action(kill_action.copy_ref());
+
+    auto menubar = make<GMenuBar>();
+    auto app_menu = make<GMenu>("ProcessManager");
+    app_menu->add_action(GAction::create("Quit", String(), [] (const GAction&) {
+        GApplication::the().quit(0);
+        return;
+    }));
+    menubar->add_menu(move(app_menu));
+
+    auto file_menu = make<GMenu>("Process");
+    file_menu->add_action(kill_action.copy_ref());
+    menubar->add_menu(move(file_menu));
+
+    auto help_menu = make<GMenu>("Help");
+    help_menu->add_action(GAction::create("About", [] (const GAction&) {
+        dbgprintf("FIXME: Implement Help/About\n");
+    }));
+    menubar->add_menu(move(help_menu));
+
+    app.set_menubar(move(menubar));
+
+    auto* window = new GWindow;
+    window->set_title("ProcessManager");
+    window->set_rect(20, 200, 320, 300);
+    window->set_main_widget(widget);
+    window->set_should_exit_app_on_close(true);
+    window->show();
+
+    return app.exec();
+}