Improvements to branch selector - partial search + pinned (favourite) branches

[nadavsinai-philips]

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We have more than one release line and so there is more than 1 "main" branch - one per release version
It would be very useful to put these branches in the top of the branch selector like the default branch, it can be per user - setting or admin set - both make sense for us, but I guess in the winder perspective it would be best if it's a user setting
in addtion - our release branch is named - release////support (with those variables replaced with values...) so people usually search just / - but this will not come up in the branch selector search which needs to whole shebang with release/.... to get to find the branch - this should be improved.