test: add a tool to test-compile all LVO combinations from xkeyboard-config

test: add a tool to test-compile all LVO combinations from xkeyboard-config

This test contains of two parts:
- a simple program to convert RMLVO commandline arguments into a keymap (and
  print that keymap if requested).
- a python script that runs through rules/evdev.xml, and tries to compile a
  keymap for sort-of every layout/variant/option combination. Sort-of, because
  we can have multiple options and it really only does one per layout(variant)
  combination.

Same thing can be done using xkbcomp, but right now it doesn't take that as
argument, it's hard-coded.

This takes quite a while, installing python-tqdm is recommended to see fancy
progress bars instead of just miles of dumps.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>