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/ESCAnimationResource.md

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+<!-- Auto-generated from JSON by GDScript docs maker. Do not edit this document directly. -->
+
+# ESCAnimationResource
+
+**Extends:** [Resource](../Resource)
+
+## Description
+
+Resource containing all defined animations and angles for
+characters movement.
+
+## Property Descriptions
+
+### dir\_angles
+
+```gdscript
+var dir_angles: Array
+```
+
+Array containing the different angles available for animations.
+Each angle is defined by an array [start_angle, angle_size].
+start_angle must be between 0 and 360.
+Angle 0 and 360 are the same and correspond to UP/NORTH
+90 is RIGHT/EAST, 180 is DOWN/SOUTH, etc
+
+### directions
+
+```gdscript
+var directions: Array
+```
+
+Array of animations for each direction, from UP to RIGHT_UP clockwise
+[animation_name, scale]: scale parameter can be set to -1 to mirror
+the animation
+
+### idles
+
+```gdscript
+var idles: Array
+```
+
+Array containing the idle animations for each direction (in the
+order defined by dir_angles): scale parameter can be set to -1 to mirror
+the animation
+
+### speaks
+
+```gdscript
+var speaks: Array
+```
+
+Array containing the speak animations for each direction (in the
+order defined by dir_angles): scale parameter can be set to -1 to mirror
+the animation