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/Demos/WidgetGallery/GalleryGML/BasicsTab.gml

@@ -126,15 +126,15 @@
 
                 @GUI::Button {
                     name: "enabled_coolbar_button"
-                    text: "CoolBar button"
-                    button_style: "CoolBar"
+                    text: "Coolbar button"
+                    button_style: "Coolbar"
                 }
 
                 @GUI::Button {
                     name: "disabled_coolbar_button"
                     text: "Disabled"
                     enabled: "false"
-                    button_style: "CoolBar"
+                    button_style: "Coolbar"
                 }
 
                 @GUI::Widget {