Utils : Updated  PositionUtils
Utils : Simplified cartesianToPolar function. Code cleanup.
Utils : Fixed PositionUtils bug.
TowerDefense : added a new type of tile : Metal
TowerDefense : Fixed goal bug in Battleground (removed coef) ans added a getTile method.
TowerDefense : Moved rotation methods from Tower to Offensive.
TowerDefense : Worked on Enemy moveToNextPoint method.
TowerDefense : Immersive mode, landscape only, HUD debug.