Couple of minor suggestions

[pokrakam]

          couple of minor suggestions:

• adding the option to flag a repo as favourite
• optionally clearing the existing abapGit database before importing the user-specified repos

Originally posted by @AndreaBorgia-Abo in #1 (comment)

[pokrakam]

@AndreaBorgia-Abo, I decided to move this to a new issue, hope you don't mind.

Seemingly simple options but when I looked into it it's not that trivial. I thought favourites might be a 10 minute job of setting an extra flag on the repo but no, it's a user profile setting. It makes sense as every user has their own favourites.

abapGit stuff is a little more effort as it all has to run without aG developer version, but these sound sensible suggestions so can look into it.