Refresh if Git Activity Occurs (checkout, branch switch, stash apply, etc.)

[JustinGrote]

If any of these activities occur, it can invalidate the tests without the filesystemwatcher being aware.

[johlju]

Would be great if this could be configurable per activity type (turn off/on). But might not be necessary if for example it could do one refresh only after a rebase is complete, a larger rebase would trigger a lot of refresh otherwise (see related issue #103).

[JustinGrote]

It still would fall under the scope of having the continuous refresh icon enabled.