1.5.0: Added IntToLayerMask, marked QuaternionToEuler as obsolete as of 2021 and fixed a couple of bugs

- Drawer: Added IntToLayerMaskAttribute, if a raw int is wanted instead of LayerMask
- Drawer: Added option to either use full or short type name, when using SerializeReferenceTo
- Extension: Fixed issue, where GetValueType and GetValue for SerializedProperty would throw exceptions, if field is private

Runtime/Drawers/QuaternionToEulerAttribute.cs

@@ -3,6 +3,9 @@ using UnityEngine.Scripting;
 
 namespace Module.Inspector
 {
+    #if UNITY_2021_1_OR_NEWER
+    [Obsolete]
+    #endif
     [AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = true)]
     public sealed class QuaternionToEulerAttribute : DrawerPropertyAttribute
     {