General issues with loading file, loading default, etc.

[vxlcoder]

I've noticed that RF will break when trying to load files, load defaults, etc.

Below is a checklist of items that need to get fixed.

• With RF enabled, File > Defaults > Load Factory Settings. RF's Add Mesh Retopology at XXX does not show (but there is still a divider?). There is a note in terminal that operator is unknown. now, Edit > Preferences > Add-ons > re-enable RF4, and notice RF's Add Mesh Retopology at XXX shows up twice!
• Load blend file that has Contours selected and some geometry selected, File > Revert, now old operators / draw handlers are sticking around causing problems in the terminal