[0.0.1] Player health, death and respawning

[MaxIsJoe]

At the moment the player is immortal and cannot die, We must change that.

Here's a list of things that needs to be taken care off when working on player deaths :

• [x] The player's sprites should rotate to simulate them falling on the ground, just like in the original game.
• [x] The respawn system must be flexible enough to allow for players to change their respawn locations while in events/dueling matches/etc
• [x] The player's screen should slowly lose color when their health is below 45%. when they're at 0% turn the entire screen black and white
• [ ] Add status effects that cause the player to lose/gain health over time.

[MaxIsJoe]

Technically we do have a respawn system now as of #47 We just don't have any respawn points active anywhere around the map or a way to assign them to characters currently; sooooo I guess I'll tick this one off?