Removed the instance clear / rotate / scale / translate transform plugins. They used delegates which is obsolete.
Fixed the inputs of the IFS instancing plugin and updated it to handle null meshes.
Fixed inputs of the texture instancing plugin and updated it to handle null meshes and use the default 'no texture' texture when no external texture is supplied.
Added vector_unity default value to Renderer.
Updated the info_text generation logic to handle textures specially and show the current source path (if any) in the info view on hover.