feat: This enables user-defined transition and uses a tween to animate the transitions (#405)

* feat: This enables user-defined transition and uses a tween to animate the transitions

fixes #344

* docs: Automatic update of API docs

* docs: Automatic update of API docs

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

docs/api/ESCTransitionPlayer.md

@@ -0,0 +1,60 @@
+<!-- Auto-generated from JSON by GDScript docs maker. Do not edit this document directly. -->
+
+# ESCTransitionPlayer
+
+**Extends:** [ColorRect](../ColorRect)
+
+## Description
+
+A transition player for scene changes
+
+## Enumerations
+
+### TRANSITION\_MODE
+
+```gdscript
+const TRANSITION_MODE: Dictionary = {"IN":0,"OUT":1}
+```
+
+The valid transition modes
+
+## Method Descriptions
+
+### transition
+
+```gdscript
+func transition(transition_name: String = "", mode: int, duration: float = 1) -> void
+```
+
+### get\_transition
+
+```gdscript
+func get_transition(name: String) -> String
+```
+
+Returns the full path for a transition shader based on its name
+
+## Parameters
+
+- name: The name of the transition to test
+
+*Returns* the full path to the shader or an empty string, if it can't be found
+
+### has\_transition
+
+```gdscript
+func has_transition(name: String) -> bool
+```
+
+Returns true whether the transition scene has a transition corresponding
+to name provided.
+
+## Parameters
+
+- name: The name of the transition to test
+
+*Returns* true if a transition exists with given name.
+
+## Signals
+
+- signal transition_done(): Emitted when the transition was played