Adjust the z-position of some decorations in the level selector.
Merge branch 'master' of github.com:j-jorge/asgp into android-port
Fix the rendering of the cannon.

There is no tweener for the cannon on Android, we just set its angle
at the target position.

Throwing cannonballs target the initial position of the mouse.
The cannon shot toward the position where the finger has been pressed.

Mouse up events are ignored on the android build.

The position of the cursor is updated when the finger is pressed. Otherwise it
stays at the position where it was pressed.
The Android build ignores the mouse move events.