Implement 22 more requests.

Specifically,
	AllocColorCells
	AllocColorPlanes
	AllocNamedColor
	ChangeKeyboardMapping
	CopyColormapAndFree
	CreateCursor
	CreateGlyphCursor
	FreeColormap
	FreeColors
	FreeCursor
	GetKeyboardMapping
	InstallColormap
	ListExtensions
	ListInstalledColormaps
	LookupColor
	QueryBestSize
	QueryColors
	QueryExtension
	RecolorCursor
	StoreColors
	StoreNamedColor
	UninstallColormap