scripting: implement comparison and negative numbers
town structure: fix workToken calculation
move src to source
use dub for building and dependency management
Merge branch '201403_dmd2063'

Conflicts:
	SConscript
	includes/d2sqlite/d2sqlite3.d
	libs/derelict/libDerelictSDL2.a
	libs/derelict/libDerelictUtil.a