Git-machete

- fixed: `git machete` now correctly infers remote for fetching of branch when the branch is associated with more than one remote
- fixed: `git machete github create-pr` and `retarget-pr` now take branch tracking data into account when finding out where (in what GitHub organization/repository) to create a PR

- added: `git machete help config` help topic and sphinx documentation page for config keys and environment variables
- added: boolean git config key `machete.worktree.useTopLevelMacheteFile` for switching the machete file location for worktrees: a single central `.git/machete` for all worktrees (as up to 3.10) or a per-worktree `.git/worktrees/.../machete` (suggested by 1wsx10)
- added: when GitHub token is invalid/expired, provide information which token provider has been used
- fixed: release to Snap Store

- added: support GitHub remote URL in the form of `ssh://gitgithub.com/USERNAME/REPOSITORY.git` (suggested by mkondratek)
- fixed: `git machete diff` doesn't crash when supplied with a short branch name (e.g. `develop`)
- fixed: `git machete {add, anno, diff, fork-point, is-managed, log, show}` don't crash when supplied with a full branch name (e.g. `refs/heads/develop`)

- added: boolean git config key `machete.status.extraSpaceBeforeBranchName` that enable configurable rendering of `status` command (suggested by kgadek)
- added: 3 git config keys `machete.github.{remote,organization,repository}` that enable `git machete github *` subcommands to work with custom GitHub URLs (suggested by kgadek)

- fixed: better rendering of edge junctions in `status`

- added: `advance` command now also pushes the branch after the merge
- fixed: `fork-point` no longer specially treats branches merged to its parent
- fixed: color scheme on 8-color terminals