added new drawables
set style of textviews to gravity center
fixed padding of whenIReceiveBrick
changed selection behaviour of NestingBricks

also removed bug (view was sometimes not or false updated)
removed unnecessary code
changed style of Lego bricks
adapted style of uservariable bricks
added uservariables.xml, fixed nullpointer
locked all bricks in actionMode, setXBrick checkbox now clickable
smoothing animation of bricks

only for those bricks with windows focus