FIX for #184: Add loading status to "Versioning" button group when clicking a button inside dropdown.

[patricknelson]

trafficstars

Fix for #184, applies to 1.3. Allow ability for user to see immediate feedback when submitting form (to reduce confusion).

Turns this:

To this:

[patricknelson]

p.s. Made the icon configurable, just in case.

[patricknelson]

Bump. This has sat for over a year... would it be possible to merge this? 😁