Redo the wall state

[henriiquecampos]

Currently on https://github.com/pigdevstudio/platform_template/tree/fsm_revamp the [wall]( state is removed from the Actor due to lots of issues. To fix it I think it will need to:

• [x] Properly calculate wall gravity
• [x] Properly apply the needed forces to make a wall climb/wall jump
• [x] Define the conditions for the fall transition