Manabars won't hide when depleted by default

Also, when a bar is set to hide when depleted, it will not show up again once another encounter starts.

* [WIP] Add new interface elements to represent the combat turn order...

This commit add two new scenes: TurnOrder and CombatPortrait.

The TurnOrder scene is designed to be a child of the CombatInterface node in
the CombatArena scene. It is initialized at the same time as the other
interface nodes, and dynamically display a CombatPortrait node for each
battlers, both PC and NPC.

For the moment, the CombatPortrait are just placeholders, and do not display
the real battlers portraits.

* [WIP] Rebuild the TurnOrder interface every time the TurnQueue is updated

* [WIP] Better CombatPortrait animation between combat turns

* [WIP] The TurnOrder node manages its own connections with signals...

... also add missing docstrings, and a CombatPortrait placeholder

* Fix previous commit, add missing Godette combat portrait

* Do not rebuild the TurnOrder interface if no battler enters of leaves the arena

... also add better combat portrait for Godette, Robi and Porcupine (256x256px)

* Animate the CombatPortrait faster

* Finally add the combat portrait of each battler

* Use battler.is_able_to_play() in CombatArena instead of directly checking the stats attribute...

... and minor comment changes in the turn order interface.

* Slightly reduce the space between CombatPortrait in the TurnOrder interface

Keep battlers in the TurnQueue, close #121

Create extensible AI for battlers

Fix #128, play the death animation correctly when a battler dies

InteractivePawn triggers actions with player input

Fix Touch Screen related issues

Compatibility with godot version > alpha2 

Small tweaks on Grid and LocalMap

instantiate class pathfinder directly with the class_name instead that preload gd file

By getting near the pawn, a small balloon will show, allowing the player to press `ui_accept` to start the interaction. They can be started automatically by setting `auto_start_interaction` to `true`. Works with both Area2D triggers and the raycasts.

For the touch, it was already working as far as I could tell.

Closes #115

instead

Transitions set to QUART, eases only in or out
Added fade anim
Made anim longer

Open and close animations added to CircularMenu

Visual destination point added to pawn leader when touch mode is active

I opted to add it to the leader, as a sprite. 
Closes #114

Closes #73

Now you can place the characters' spawn position in the level editor

Fix #111, fix 110

Fix crash with mutating array when selecting monsters. With only the type hint the local array would not reinitialize in Godot 3.1 alpha 2, causing a crash

Grid -> GameBoard
Add types to GameBoard
The pathfinder node doesn't inherit from anything. It uses an Astar node
to find the path between 2 points on a 2d grid

needed as I changed how RectExtents works

closes #108

Most of the work for #108

Currently only resizes uniformly around the rectangle's center! It needs
more code to add support for all 4 anchors. Or just fixing the issue
below, restoring the move tool's functionality and deselect, could do
the trick

RectExtents's internals changed a little, now it calculates its own
_rect property, a Rect2, based on its size and offset

Known issues: The input code blocks the move tool and selecting other
nodes at the moment

This is an exercise to get a sense for Godot's EditorPlugin API and
prepare some tutorial on the subject.

Big thanks to xphere, I used his godot-zone plugin as a reference to get
started :)