Added building support for UE1 and UE2 games.

This patch adds environment detecting for UE1/UE2 and UE3, and instigates the correct .exe file for each environment.

Known issues:
  The options given after selecting are not working except for launching the game without a selected map.
  
For example given the commandline:
  UT2004.exe 127.0.0.1?SpectatorOnly=0 -log -newwindow

Works as expected when doing it by hand, but when done by the plugin UT2004 thinks that the -log and -newwindow params are part of 127.0.0.1(or map's name). I don't know why, but maybe you know if Python or Sublime Text is doing something weird there.


Note: Does not support caching, debugging, and anything else really, but Syntax highlighting and building.
Warning: I have commented out some IMPORTANT? lines as they did not make any sense to me as to what they are and they were preventing me from adding support, so don't blindly apply this patch without fixing those line if you can :) (Marked by FIXME or TODO)