Agdbentures don't crash if engine don't exist. we call make_engine.py before launching level if engine_version is not found. Add an argument in make_engine.py to choose which version we want for the level specified if version is not found to launch faster

Added dummy fix_ in simple_map that tries to change the map width.

from levels (done for 'simple_map')

during testing due to absolute path for level.

- utils moved from level/utils to loader/loader_utils
- created a prepare_level function
- loading code moved from graphic/window to loader/loader
- test_level function moved to the tests/testLevel script
- window now has a start_level function which is less ambiguous
  than previous load_level function
- cleaned the loading w.r.t. filenames and level names

Catching some errors when trying to create a level when testing.

Currently, the number of `cnext` commands used where incorrect because of
duplications of `printf` lines in the .c level source code, with languages
hints in comments.

fix validation for 05_key that was using the wrong tracker. Added fooproof code to avoid same error in the future

update keys with sprites for door disappearing + fixing restart that did not call game_view restart_level function