Feature request: add an option to mirror/flip the screen

[ghanku]

add an option to mirror/flip the screen either by using a separate function or just by adding numbers 4 to 7 to Set_Rotation() args, where 4 is 0 degrees mirrored, 5 is 90 degrees mirrored and so on. for the IL9225 i was able to mirror only on 0 and 180 degrees by writing 0x1020 and 0x1010 respectively to the MD register, i was not able to mirror it on 90 and 270 degrees.