Stable interface for both Animation player and Animated Sprite (#363)

Co-authored-by: Dennis Ploeger <develop@dieploegers.de>

docs/api/ESCAnimationPlayer.md

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+<!-- Auto-generated from JSON by GDScript docs maker. Do not edit this document directly. -->
+
+# ESCAnimationPlayer
+
+**Extends:** [Node](../Node)
+
+## Description
+
+An abstraction class to expose the same animation methods for noth
+AnimatedSprite and AnimationPlayer
+
+## Method Descriptions
+
+### \_init
+
+```gdscript
+func _init(node: Node)
+```
+
+Create a new animation player
+
+#### Parameters
+
+- node: The actual player node
+
+### get\_animation
+
+```gdscript
+func get_animation() -> String
+```
+
+Return the currently playing animation
+**Returns** the currently playing animation name
+
+### get\_animations
+
+```gdscript
+func get_animations() -> PoolStringArray
+```
+
+Returns a list of all animation names
+**Returns** A list of all animation names
+
+### is\_playing
+
+```gdscript
+func is_playing() -> bool
+```
+
+Wether the animation is playing
+**Returns: Wether the animation is playing**
+
+### stop
+
+```gdscript
+func stop()
+```
+
+Stop the animation
+
+### play
+
+```gdscript
+func play(name: String, backwards: bool = false)
+```
+
+Play the animation
+
+#### Parameters
+
+- name: The animation name to play
+- backwards: Play backwards
+
+### play\_backwards
+
+```gdscript
+func play_backwards(name: String)
+```
+
+Play the given animation backwards
+
+#### Parameters
+
+- name: Animation to play
+
+### has\_animation
+
+```gdscript
+func has_animation(name: String) -> bool
+```
+
+Check if the given animation exists
+
+#### Parameters
+
+- name: Name of the animation to check
+**Returns** Wether the animation player has the animation
+
+### seek\_end
+
+```gdscript
+func seek_end(name: String)
+```
+
+Play an animation and directly skip to the end
+
+#### Parameters
+
+- name: Name of the animation to play
+
+## Signals
+
+- signal animation_finished(name):