Ofscreen lines

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: https://git.card10.badge.events.ccc.de/card10/firmware/issues/178

Documentation/pycardium/display.rst

 ``display`` - Display
 =====================
 
+The display module let's you draw on the card10's display.
+Pixels are addressed from top left to bottom right with a range of x: 0 to 159 and y: 0 to 79.
+
+.. code-block:: text
+
+   0,0
+      +---------------------+
+      |                     |
+      |                     |
+      |                     |
+      |                     |
+      +---------------------+
+                           159,79
+
+Drawing operations are clipped, pixels outside of the screen will be ignored.
+
 .. automodule:: display
    :members: