Removed redundant Vehicle class UpdateStops() call
Simplified physics model. Removed drag.
Class formatting and syntax fixes.
Ecipse project rules change (paths to SDL).
General code cleanup.

Add: Added entity comments and class descriptions.
Change: Syntax and code formatting.
Change: Removed some unused variables and commented lines.
Change: Lots of comments translated from BG to EN.
Rewritten vehicle pos game arena bounds check.
Merge remote-tracking branch 'origin/master'
Updated TODO list