feat: abort merge

[thegeneralist01]

Add a command to abort a merge conflict. Equivalent to git reset --merge.

This PR and #934 address the following issues:
Closes #702
Closes #872
Closes #906
Partially addresses #920

[thegeneralist01]

Also, a few things to note in the changes.

• 61f5101: I changed the build platform to node - the project wouldn't build otherwise.
• 5aee66f: Add isomorphic-git as a vendor package - changes made to add a merging strategy. Bumped up a few versions due to security issues.

[Vinzent03]

As for your other pr, please don't add isomorphic-git as an archive or change other build configuration.
What is the exact workflow where this command helps? There is also the Raw Command command to run arbitrary commands like merge --abort.

[thegeneralist01]

There is also the Raw Command command to run arbitrary commands like merge --abort.

Didn't know this. Cool, then, you can close this one if you want.