Fixes #2771

Closes #2764

Support setting git clone protocol `http`, `https` or `ssh`.
Config name: `gitFsProtocol`.
Platform independent.

Closes #2708

Closes #2648

Closes #2752

Adds a call to getBranchStatus() from getPr() so that we are correctly calculating pr.canMerge status.

Closes #2735

In `getPrFiles` function, when requesting MR changes to GitLab API
(in order to return files modified by the MR), we should iterate over
`changes` property in the HTTP body response, and return `new_path` as
the filename.
See: https://docs.gitlab.com/ee/api/merge_requests.html#get-single-mr-changes

Closes #2748

This reverts commit ea8bcbc9.

This reverts commit 8f0279ec.

This reverts commit ad834053.

Closes #2749

Rewrite docker versioning to support versions of any size.

Closes #2357, Closes #2358

This reverts commit 10ddee60.