Add ESCAnimationResource to hold characters animations. (#342)

Co-authored-by: StraToN <StraToN@users.noreply.github.com>
Co-authored-by: Dennis Ploeger <develop@dieploegers.de>
Co-authored-by: dploeger <dploeger@users.noreply.github.com>

docs/api/ESCAnimationName.md

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+<!-- Auto-generated from JSON by GDScript docs maker. Do not edit this document directly. -->
+
+# ESCAnimationName
+
+**Extends:** [Resource](../Resource)
+
+## Description
+
+Class defining an animation to use for an angle.
+
+## Property Descriptions
+
+### animation
+
+```gdscript
+export var animation: String = ""
+```
+
+Name of the animation
+
+### mirrored
+
+```gdscript
+export var mirrored: bool = false
+```
+
+Animation mirror (false is no mirror, true is mirrored)