Everywhere: It's now "Foobar", not "FooBar", and not "foo bar"

I hereby declare these to be full nouns that we don't split,
neither by space, nor by underscore:

- Breadcrumbbar
- Coolbar
- Menubar
- Progressbar
- Scrollbar
- Statusbar
- Taskbar
- Toolbar

This patch makes everything consistent by replacing every other variant
of these with the proper one. :^)

Userland/Libraries/LibGUI/CMakeLists.txt

@@ -12,7 +12,7 @@ set(SOURCES
     Application.cpp
     AutocompleteProvider.cpp
     BoxLayout.cpp
-    BreadcrumbBar.cpp
+    Breadcrumbbar.cpp
     Button.cpp
     Calendar.cpp
     CheckBox.cpp
@@ -56,7 +56,7 @@ set(SOURCES
     LinkLabel.cpp
     ListView.cpp
     Menu.cpp
-    MenuBar.cpp
+        Menubar.cpp
     MenuItem.cpp
     MessageBox.cpp
     Model.cpp
@@ -67,12 +67,12 @@ set(SOURCES
     OpacitySlider.cpp
     Painter.cpp
     ProcessChooser.cpp
-    ProgressBar.cpp
+    Progressbar.cpp
     RadioButton.cpp
     RegularEditingEngine.cpp
     ResizeCorner.cpp
     RunningProcessesModel.cpp
-    ScrollBar.cpp
+        Scrollbar.cpp
     ScrollableWidget.cpp
     SeparatorWidget.cpp
     Shortcut.cpp
@@ -81,14 +81,14 @@ set(SOURCES
     SpinBox.cpp
     Splitter.cpp
     StackWidget.cpp
-    StatusBar.cpp
+        Statusbar.cpp
     TabWidget.cpp
     TableView.cpp
     TextBox.cpp
     TextDocument.cpp
     TextEditor.cpp
-    ToolBar.cpp
-    ToolBarContainer.cpp
+        Toolbar.cpp
+        ToolbarContainer.cpp
     TreeView.cpp
     UndoStack.cpp
     Variant.cpp