git: allow overriding default master branch with an env variable.

vcs-settings: when setting landing ref from UI switch default GIT branch too. fixes #5663

caches: fixed error for unique non-ascii cache keys

files: fixed unicode problems in specially encoded paths handler.

commits/summary: unify fetching remote attribute in summary and commits page to properly and in the same way show the data.

files: escape special chars for metadata loading to prevent breaking url with chars like #, <. - fixes #5672

caches: invalidate cache on remote side from repo settings alongside local cache.

vcs-cache: enable more methods, and fix arguments calls

drafts: show TODO drafts properly. - Fixes #5668

vcs-call-cache: controll via hidden .ini flag