Added support of group extending

Author: ProFiLeR4100

README.md

@@ -65,6 +65,12 @@ void ExtendInspectorEnd(ExtendableInspector inspector)
 
 Allows adding controls at the end of the inspector.
 
+```csharp
+void ExtendInspectorGroup(inspector: ExtendableInspector, string group)
+```
+
+Allows adding controls at the beginning of a group in the property list for object.
+
 ```csharp
 void ExtendInspectorCategory(inspector: ExtendableInspector, string category)
 ```

addons/extendable_inspector_for_cs/README.md

@@ -65,6 +65,12 @@ void ExtendInspectorEnd(ExtendableInspector inspector)
 
 Allows adding controls at the end of the inspector.
 
+```csharp
+void ExtendInspectorGroup(inspector: ExtendableInspector, string group)
+```
+
+Allows adding controls at the beginning of a group in the property list for object.
+
 ```csharp
 void ExtendInspectorCategory(inspector: ExtendableInspector, string category)
 ```

addons/extendable_inspector_for_cs/core/ExtendableInspector.cs

@@ -8,6 +8,7 @@ public partial class ExtendableInspector : EditorInspectorPlugin {
 	private static string[] Methods = {
 		"ExtendInspectorBegin",
 		"ExtendInspectorEnd",
+		"ExtendInspectorGroup",
 		"ExtendInspectorProperty",
 		"ExtendInspectorCategory"
 	};
@@ -48,5 +49,11 @@ public override  bool _ParseProperty(GodotObject godotObject, Variant.Type type,
 
 		return false;
 	}
+
+	public override void _ParseGroup(GodotObject godotObject, string group) {
+		if (godotObject.HasMethod("ExtendInspectorGroup")) {
+			godotObject.Call("ExtendInspectorGroup", this, group);
+		}
+	}
 }
 #endif