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/LibGfx/SystemTheme.cpp

@@ -121,7 +121,7 @@ Core::AnonymousBuffer load_system_theme(const String& path)
     DO_PATH(TitleButtonIcons, false);
     DO_PATH(ActiveWindowShadow, true);
     DO_PATH(InactiveWindowShadow, true);
-    DO_PATH(TaskBarShadow, true);
+    DO_PATH(TaskbarShadow, true);
     DO_PATH(MenuShadow, true);
     DO_PATH(TooltipShadow, true);