#17 Free rotation of graphic objects

[prince]

This task is a continuation of 3025116 - rotate graphic objects. Task 3025116 supports only rotation of 90 degrees.
Should support rotation of any angle. Start code is already implemented. The most difficult part is to implement the resize mechanism of "free-rotated" objects. Seems me, redesign of ResizeHandle object should be done.

I suggest to start with this task after version Alpha will be issued.