Merge pull request #77 from jackykschou/JackySprint10

Jacky sprint10
Merge pull request #78 from jackykschou/JackySprint10

updated powerup prefabs, implementing Survival mode AStar update events
Updated Prefab Positions to make AStar graph smaller (8x Performance Increase on scan), Made SurvivalModeManager Spawn Areas between different locations
Merge pull request #79 from jackykschou/AStarGraphResize

Updated Prefab Positions to make AStar graph smaller (8x Performance Inc...
Merge branch 'develop' into JackySprint10