Blender Git Loki

fix [#28005] Python Add-Ons are constantly reloaded if twice in the path
Addons are checked for their timestamps and reloaded when it changes but this failed when, 2 addons had the same name since different times caused 2 reloads on every redraw.

Now when duplicate addons are in the path now give a error message in the UI and print path conflict in the console and don't thrash reloading.