Added the fife_settings.py extension. This provides a small utility class for loading and saving settings along with a dialog box for setting screen resolution and other things. Updated the shooter demo and rio_de_hola to use the new settings extension.

{
	'opengl': ['core/video/opengl/', 'core/gui/base/opengl/'],
	'zip': ['core/vfs/zip/'],
	'script-python': ['swigwrappers/python'],
	'script-lua': ['swigwrappers/lua'],
}