I've really got to take some rest 😂

fix wrong node path in DebugInterface

Trying to use Resource to gather all the save data and let Godot store it on the
disk for us
This makes it possible to edit savegames from the inspector
Added a DebugInterface to save and load data, for testing purpose

Basic quest system added

Refactor GrowthStats out of CharacterStats

set initial animation for PawnAnim

Just like BattlerAnim before it, we have pawns that are reusable character
controllers, that apply to NPCs and to the playable character. And these pawns
could be any character in the game, so we need to be able to change the skin on
them.

Having separate scenes for animation is also essential for animators to be able
to do their job properly, while the devs can keep working on the Pawn scenes

Also added variables to store references to nodes like AnimationPlayer,
Added Robi sprite, #93

Add physics layers, remove boolean variable to check if the character is
interacting, now the game pauses during interactions
Now using physics layers and masks as well to only interact with the player's
pawn.

This relies on pausing the game: The NPCs still process during pause, as
e.g. if they were walking around you may not want to freeze the entire
game.

The PawnLeader stops as it inherits its pause mode from LocalMap and
GameBoard.

The StartCombatAction unpauses the game to play combat. I've changed the
interaction with map actions so they use the "finished" signal instead
of InteractivePawn waiting for the method to return.

/!\ Nodes you add to on instanced scenes (interactive pawns in this case) are lost when you rename a parent!