motioner: Add a checkbox to toggle wireframe rendering for preview
scripter: Introduce first working version of scripting window

Scripting window is a Windows OS window (not a GLWindow) that will be
able to be used to run and debug Squirrel scripts.
It's only capable of displaying console output and entering console
commands yet.

The window can be shown by "scripter" console command.

We're using Windows API and resource scripts (edited by ResEdit) to
implement the GUI, but we may be better consider using platform-
independent GUI toolkits such as Qt or wxWidgets.