Git-machete

- improved: `slide-out` can target branches with any number of downstream (child) branches (contributed by asford)
- fixed: detection of no-op rebase cases in fork-point algorithm
- fixed: if a branch is merged to its parent, `git machete status -l` now always displays an empty list of commits
- improved: `status` and `traverse` by default also consider squash merges when checking if a branch is merged to parent (contributed by asford)
- added: `--no-detect-squash-merges` flag in `status` and `traverse` to fall back to strict merge detection

- fixed: `add` without `--onto` crashing when the current branch is not managed
- fixed: commit message and PR description for `NixOS/nixpkgs`

- added: `--sync-github-prs`/`-H` and `--token` options to `anno`

- Enabled Ctrl + left-click to work as a right-click for macOS users, for displaying the machete actions on a branch.

- Enabled context-menu <i>Override Fork Point...</i> action for branches that are out of sync (red-edge).
- Fixed missing <i>Open Git Machete Tab</i> in Git menu.

- Added a warning dialog window that pops up when `Sync To Parent By Merge` is about to be used.