Sync code with IRIS after all codebase changes

[isc-svelury]

When the codebase changes after switching branches or merging, we need to have some way to sync changes back to IRIS. Having something similar to the way we handle git pull would probably work best.

[isc-svelury]

Reload after code changes

We want to recompile the files that are changed after a git operation with something like the pull event handlers. This would mean getting a diff and reloading the specific files.

1. For a new branch creation, it doesn't matter. The code in IRIS should be up-to-date with the previous branch.
2. For a local or remote branch checkout:

   git diff <new_branch> <old_branch> --name-status
   

3. After a merge or commit:

   git diff HEAD HEAD~1 --name-status
   

Note: This doesn't cover reloading after stashing or discarding changes, and applying or popping a set of changes from the stash.