Overlay icons for hard-&symlinks only enabled by default

[DrShark]

Total Commander has next option disabled by default:
"Show overlay icons, e.g. for links"
It seems that by default it is disabled for safety reason, because [there are] "Explorer extensions which use overlay icons, like some file version systems" and may cause TC crash.

My suggestion is to add an option (and enable it by default) to show overlay "shortcut" icons only for hardlinks and symbolic links. If also matters for safety, because if user edit content of a file, and Total Commander doesn't show indication that the file is a hardlink, user don't aware of changes to all other hardlinks of that file. With symlinks it will also solves possible confusion where user edit empty file, adding some data to it, saving changes and "file" size is still 0.

Initially I wanted to make a suggestion about some kind of warning showed by TC each time user try to open hard/sym-link, use its context menu or edit it via F4. Sometimes even if overlay icons enabled in TC, I remember it didn't update overlay icons for new hardlinks, so warning seems to be more reliable here. But I think such warning may be very annoying, so enabled by default icons for hardlinks and symlinks is a good compromise.