Version 1.21 (29/11/2021)

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* Update to 2020.3.23f1

* #104 Deinit data context node connector instead of only removing value listener

* #104 Destroy data node when the last listener is removed

* #99 Add indicator to path popup to make it easier to find the selected path

* #97 Remove Data Bind Settings.asset and do not include it in packages

* #103 Use EditorGUI.BeginProperty/EditorGUI.EndProperty to have prefab functionality for context types and type selections

* #100 Use EditorGUIUtility.singleLineHeight and EditorGUIUtility.standardVerticalSpacing for custom property drawers instead of hard-coded values

* #101 Add DisallowMultipleComponentAttribute to ContextHolder class

* #102 Fix null reference exception in ContextTypeDrawer.cs