Ofscreen lines

Merged Philip Stewart requested to merge sodoku/firmware:ofscreen_lines into master

The animation of the simple_menu used in the main menu had the issue that there is a black line visible at the top. This is due the gfx_puts method ignoring lines, where the top pixel of the string is above the top of the screen. As gfx_puts uses gfx_setpixel which in turn ignores pixels outside of the screen, I removed the check in gfx_puts.

I also removed the ranges from the documentation of the individual python functions and added a general documentation about the screen and it's ranges.

Related: #178

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