Remove non-working examples.
Add new examples.
Add an examples browser.

The initial look is still very rough, but the basic functionality is
there.
Number the examples so they are in order.

Also, use the title property to display the correct name in the
examples browser.
Better styling for example buttons.

Example buttons are now custom drawn, and in a custom wrapping layout.
Category folders have numbers so they can be sorted.

The numbers are removed in the code.
Better styling for category buttons.
Remove category / subCategory from Example class.

This is now implicit from the directory structure.
Add support for subcategories.
Better styling for example browser.

The look is now in line with the rest of the application.
Clean up the examples browser code.

Remove some unnused variables and constants.
Force category button size to be bigger.
Only show the menu bar on Mac.
Make examples browser window bigger.
A scrollbar appears if there are many examples.
Remove all current examples in preparation of new examples.
Merge branch 'example-browser'