Reorganize code

[ACBob]

• [x] Separate Client/Server Code
• [ ] Segment code into key DLLs loaded by an "Engine"
  • [x] Rendering (See #12)
  • [ ] Windowing
  • [x] Utility Stuff (such as math, parsers, etc.)
  • [ ] Client
  • [ ] Server
  • [x] Shared (Between client/server, so stuff like the ConVar system and some chunk/world code)