Add option to disable icon overlays in Windows Explorer

I'm gonna try the registry ownership-to-lockout "fix" as I dont anticipate adding any new software that will use the overlays at this point.  I imagine between linkshellextension, the cloud providers i use, and tortoisesvn/git that covers it.  Anything newer would potentially be moving away from them and using the method onedrive uses that does not "cost" an overlay spot.   Since the number of overlays alotted is evidently a major job to fix, microsoft deemed it easier to change the way theyre handled and I'm assuming software developers are aware and will follow suit.

The new icloud software from apple uses the new system as well.   AKA, dropbox either needs to make it possible to stop the leapfrogging or change to the new system.

I use "some" of the dropbox overlays, but when you have a total of i think 14 usable, taking up 10 every update is obnoxious.  A checkbox checkbox that says dont modify that registry key after the initial install is probably easy as can be to implement.