Add "Copy short Commit Hash to Clipboard" button

[Chrismettal]

Summary of the issue:

Copying a commit hash via the context menu is awesome, but most of the time when telling someone to "please use commit X" you only really need the abbreviated short hash, so a new button in the context menu for the short hash should be added.

[henryzhuhr]

Why is this merge blocked? How to copy a short commit hash? Most of the time only a short hash is required.

[napter]

I would also like to copy a short commit hash - the long hash makes cli commands messy