v7.0.0

• added brightness option to with light command in .rooms files
• added fixinter lamps' getters to Entity
• added Texture.equalsAny()
• added Texture.equals() to compare filename strings, not just Texture instances
• added selection api to Polygons:
  • selectAll
  • selectBy
  • hasSelection
  • clearSelection
  • selectOutOfBounds
  • selectWithinBox
  • selectByTextures
  • removeSelected
  • apply
  • copy
• extended methods of Polygons to work with selections:
  • makeDoubleSided
  • moveToRoom1
  • move
  • scale
• added Entity.fromPolygons()