https://wiki.unrealengine.com/Creating_an_Editor_Module
https://wiki.unrealengine.com/UMG,_Custom_Widget_Components_And_Render_Code,_Usable_In_UMG_Designer
https://wiki.unrealengine.com/Creating_an_Editor_Module
https://wiki.unrealengine.com/UMG,_Custom_Widget_Components_And_Render_Code,_Usable_In_UMG_Designer