Create a structure where contributors can easily add new characters

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Ideas

The assets are placed in the following structure:

assets/
|--- characters/
|     |--- dragon_ball_goku/
|     |     |--- hurt/
|     |     |     `--- gruntsound.wav
|     |     |--- shot/
|     |     |     `--- skweak3.ogg
|     |     `--- sprites/
|     |          |--- down.png
|     |          |--- left.png
|     |          |--- right.png
|     |          |--- shot.png
|     |          |--- shooting.png
|     |          |--- standing.png
|     |          `--- up.png
|     |--- dragon_ball_minicell/
|     |     |--- hurt/
|     |     |     `--- cut_grunt2.wav
|     |     |--- shot/
|     |     |     `--- skweak2.ogg
|     |     `--- sprites/
|     |          |--- down.png
|     |          |--- left.png
|     |          |--- right.png
|     |          |--- shot.png
|     |          |--- shooting.png
|     |          |--- standing.png
|     |          `--- up.png
|     |--- other/
|     |     |--- hurt/
|     |     |     |--- sound1.wav
|     |     |     `--- sound2.wav
|     |     `--- shot/
|     |           |--- sound1.ogg
|     |           `--- sound2.ogg
|     |     `--- sprites/
|     |          |--- down.png
|     |          |--- left.png
|     |          |--- right.png
|     |          |--- shot.png
|     |          |--- shooting.png
|     |          |--- standing.png
|     |          `--- up.png
|--- background_music/
|     |--- FoxSynergy - Chaos Lily.mp3
|     `--- other.mp3
|--- life_boxes/
|     |--- default_left/
|     |     |--- lifebar.png
|     |     `--- life_box.png
|     `--- default_right/
|           |--- lifebar.png
|           `--- life_box.png
|--- messages/
|     |--- default_user_wins_es.png
|     `--- default_user_loses_es.png
`--- scenarios/
      |--- dragon_ball_namek.jpg
      `--- other.jpg

Scenarios and background music can simply be added on their respective directories.

Characters consist of three groups of assets: hurt sounds, shot sounds and sprites.

A character can contain more than one sound for group hurt and shot. The game will cycle through them in secuential order.

Each character has exactly 7 sprites. Four sprites for movement: down, left, right, up. One sprite for standby: standing. One for shooting: shooting. One for the shot.