Updates :
- Movement System,
- Inventory,
- Map,
- New boss

Movement System :
Optimisation of this one, less call of function therefore less CPU used.

Inventory :
As a request, the inventory stays open after clicking out of it, now it will not.

Map :
Last system was a boss per floor, after clearing the floor you switch to a new floor biome.
Now you there will be 3 floors per biome and only the last biome floor you will have to fight a boss.

New boss :
The last boss was here only to have something to fight. Now each biome will get his own opponent.