v4.2.0

• Added world indices, allowing for multiple players to exist in discrete levels with their own coordinate spaces simultaneously
• Added context:getWorldIndex()
• Added camera.getWorldIndex()
• Updated region and entity renderers
• Added worldIndex network number to entities
• Added entity:getWorldIndex() convenience method
• Added player.getInOrNearRegion( region )
• Added trigger entity base class
• Added region.findNextWorldIndex()
• region.getAtPosition( position ) is now region.getAtPosition( position, worldIndex )
• region.load( name, x, y ) is now region.load( name, x, y, worldIndex )
• region( name, x, y ) is now region( name, x, y, worldIndex )
• Added region:getWorldIndex()
• Added region:setWorldIndex( worldIndex )
• Code cleanup
• Fixed crash in audio options panel