LibGUI: Rename GEventLoop.{cpp,h} => GWindowServerConnection

The GEventLoop class is long gone, and the only class in these files is
GWindowServerConnection, so let's update the file names. :^)

Applications/DisplayProperties/DisplayProperties.cpp

@@ -1,3 +1,5 @@
+#include "DisplayProperties.h"
+#include "ItemListModel.h"
 #include <AK/StringBuilder.h>
 #include <LibCore/CDirIterator.h>
 #include <LibDraw/PNGLoader.h>
@@ -6,7 +8,6 @@
 #include <LibGUI/GBoxLayout.h>
 #include <LibGUI/GButton.h>
 #include <LibGUI/GDesktop.h>
-#include <LibGUI/GEventLoop.h>
 #include <LibGUI/GFileSystemModel.h>
 #include <LibGUI/GGroupBox.h>
 #include <LibGUI/GLabel.h>
@@ -17,12 +18,9 @@
 #include <LibGUI/GToolBar.h>
 #include <LibGUI/GWidget.h>
 #include <LibGUI/GWindow.h>
-
+#include <LibGUI/GWindowServerConnection.h>
 #include <Servers/WindowServer/WSWindowManager.h>
 
-#include "DisplayProperties.h"
-#include "ItemListModel.h"
-
 DisplayPropertiesWidget::DisplayPropertiesWidget()
     : m_wm_config(CConfigFile::get_for_app("WindowManager"))
 {

Applications/Piano/main.cpp

@@ -5,7 +5,6 @@
 #include <LibDraw/PNGLoader.h>
 #include <LibGUI/GAction.h>
 #include <LibGUI/GApplication.h>
-#include <LibGUI/GEventLoop.h>
 #include <LibGUI/GMenu.h>
 #include <LibGUI/GMenuBar.h>
 #include <LibGUI/GWindow.h>

Applications/Taskbar/TaskbarButton.cpp

@@ -1,6 +1,6 @@
 #include "TaskbarButton.h"
 #include <LibGUI/GAction.h>
-#include <LibGUI/GEventLoop.h>
+#include <LibGUI/GWindowServerConnection.h>
 #include <WindowServer/WSAPITypes.h>
 
 TaskbarButton::TaskbarButton(const WindowIdentifier& identifier, GWidget* parent)

Applications/Taskbar/TaskbarWindow.cpp

@@ -4,7 +4,6 @@
 #include <LibGUI/GBoxLayout.h>
 #include <LibGUI/GButton.h>
 #include <LibGUI/GDesktop.h>
-#include <LibGUI/GEventLoop.h>
 #include <LibGUI/GFrame.h>
 #include <LibGUI/GWindow.h>
 #include <WindowServer/WSAPITypes.h>

Applications/Taskbar/WindowList.cpp

@@ -1,5 +1,5 @@
 #include "WindowList.h"
-#include <LibGUI/GEventLoop.h>
+#include <LibGUI/GWindowServerConnection.h>
 #include <WindowServer/WSAPITypes.h>
 
 WindowList& WindowList::the()