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

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

project.godot

@@ -89,6 +89,11 @@ _global_script_classes=[ {
 "language": "GDScript",
 "path": "res://addons/escoria-core/game/core-scripts/resources/esc_animationname.gd"
 }, {
+"base": "Node",
+"class": "ESCAnimationPlayer",
+"language": "GDScript",
+"path": "res://addons/escoria-core/game/core-scripts/esc_animation_player.gd"
+}, {
 "base": "Resource",
 "class": "ESCAnimationResource",
 "language": "GDScript",
@@ -486,6 +491,7 @@ _global_script_class_icons={
 "DecGlobalCommand": "",
 "ESCActionManager": "",
 "ESCAnimationName": "",
+"ESCAnimationPlayer": "",
 "ESCAnimationResource": "",
 "ESCBackground": "",
 "ESCBackgroundMusic": "",