Characters animations using AnimationPlayer

[mgdesign]

Done:

• character facing direction switch logic based on destination point
• character animation based on AnimationPlayer and naming conventions
• character turning and animation triggers while moving through the walk cycle
• public play_animation() on the singleton, that can also be used in other interactions
• animation added to the AnimationPlayer for any orientation are now play according to the player looking point
• basic fallback logic on walk animations
• added talk animation to test using the simplest case of animation
• updated demo game main character sprite to introduce animated walk up/down/left cycles

TODO:

• figure out if it is possible to implement the logic that relies on character looking direction and fallback for all the animations in general
• add the AnimationPlayer in the character template

[stickgrinder]

Why are you stopping the animation if you call play_animation() without parameters? Isn't it better to log a warning to the console and leave the running animation going.

In my head you want to stop an anim by explicitely invoking a stop_animation() method.

[stickgrinder]

Now that I think of it, you can't reach this point with a null value, the type is explicit for that argument.

[mgdesign]

Fixed, thanks for the feedback!

[stickgrinder]

I would keep the animation suffix consistend with "down" and "up", so walk_d' and walk_u`.

[mgdesign]

Good point! I'm fixing this

[mgdesign]

Add a few improvements (update the main comment accordingly) thanks to a great pair programming session with @stickgrinder and drbb