[Touch Screen Areas] Developer version

Development version: Unity project + Embedded package

PS: In this version, this package is in Packages/com.lean.touch.extensions.screenareas folder

• Identify the touched screen areas by an enum LeanTouchScreen.SideDirection
• Show gizmos
  • Divide the screen in a cross (4 areas)
  • Show a circle on tap position
  • Show a rect white when tap in all area