Update tracker so we have the new bp features.

This is a WIP

What is working ?
- Player movement.

What is missing ?
- buttons
- input forwarding to python motor
- all the npc, objects and layers
- allow to change map
- ...

level_curses.py:78:4: W0221: Number of parameters was 1 in
'AbstractLevel.read_cmd' and is now 4 in overridden
'LevelCurses.read_cmd' method (arguments-differ)

- Remove useles function
- Move shared function with level_arcade

- Add full path to the default tileset if not given
- Fix default argument in create_map
- Add default tileset constant in `constants.py`

- break long lines
- remove useless attributes
- fix dangerous default value in apply_unifdef
- update comments and docstrings

- Add agdb comments to the tutorials.
- Add custom objects and connect them. The utils docstring for
  more informations.
- bug fix in eventlist.