Client|Map Renderer: Added DrawList

Provides a drawable list of buffered GL primitives/or GL commands.
Client|Map Renderer: Added DrawLists

Encapsulates DrawList management.
Client: Added RenderSystem

Presently this merely acts as the owner of the DrawLists.
Client|Map Renderer: Began dismantling of the old render lists module
Refactor|Client|Map Renderer: Updated all drawing to use DrawLists
Refactor|Client|Map Renderer: Updated RL_RenderAllLists() to use DrawLists; cleanup

TODO: Redesign DrawList specification/"RTU map" stuff.
TODO: Revise plane geometry generation to build tristrips.
TODO: Replace the global map geometry buffer with GLBuffer(s).
TODO: Cleanup.