fb rotation merge directive

[Michal Suchanek]

Hello

Attaching a merge directive which includes multiple patches which
should bring the possibility to rotate the graphical video output
where the fb library is used for drawing.

As the patches were against r1782 and unlike git the bzr workflow does
not seem to offer a rebase this is probably as good as the format
gets.

The code should work - the modified videotest results seemed OK.

However, packing of different stuff into different files and function
naming may need improvement.

The mode direction specification is very rudimentary - you put some
letters in front of the resolution specification. I did not find a
nice solution for this.

Since there is no imminent release freeze perhaps this could finally
get into grub.


Thanks

Michal

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