--dbg
unify RenderTheme 'node'/'way','closed' rules to match any 'element'
changed 'fixed' line option to 'fix'
update themes
initialize TileLayer/Manager when added at runtime

fixes NPE where TileManager.onUpdate is run without previous init() when
TileLayer is added at runtime
use any (direct) ByteBuffer
add custom test layer
disco mode - almost, needs shuffle and blinking
use TagSet instead of Tag[] in MapElement