Add "rotate" parameter to setup(), extend rotation in write()

[steve8x8]

Basic rotation, reflecting the design of the display (modules combined this or that way), should be set during setup(). An extra rotation during write() would make a nice addition, in particular if angles of 90, 180 and 270 degrees would be supported :)
(BTW, what about mirroring?)

[marcelstoer]

That's partially an issue due to lack of proper documentation. While writing you can transform:

• rotate left/right
• invert, is that your mirroring?