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

The initial look is still very rough, but the basic functionality is
there.
A port control now contains a reference to the network path of the node its port belongs to.

This fixes #302
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.
New NodeBox application icon.
On Windows, set the application icon in the taskbar.
Add a new installer header image.
Add original NodeBox app / file icon artwork.
New NodeBox file icon.
Add NodeBox file artwork.
Add installer icon artwork.
Add "encode URL" node.

Users can convert text to make it suitable to be integrated into a URL.