Paint the Town Red v0 5 0

Version 0.5.0 ChangesAdded Arena Challenge 1 Leaderboards for Scenario Challenges and Arena New Main Menu New pathfinding system (WIP) Added Challenge mode for Scenarios Replaced One Hit Kills modifiers with Weak Enemies and Weak Player Many other changes and fixes**This is an abbreviated changelist. We'll attempt a more complete list of more of the minor changes soon.