micromix #67 Animate cassette from the case to the player

* animation of K7 if not in post-list
micromix #67 Animate cassette from the case to the player

* no more scale animation
* no more left/right movment
K7 shadow + new image

* empty window area cassette-front-2.png + PNG8
* add before/after for shadow
K7 animation

* left tape is bigger than right on start
* counter change while rewind/forward
* reset counter to 0 when kasset is out
* faster forward/rewind