#1239 - Clone workspace

[TripleSpeeder]

##Add workspace clone functionality

This should fix https://github.com/trufflesuite/ganache/issues/1239. The new icon "clone-regular.svg" is from FontAwesome project, so no licensing issues expected ;)

PR includes 2 commits - First one adds "clone" method to workspace and according unit tests. Second commit includes actual UI changes.

[TripleSpeeder]

That's my first PR for Ganache, so feel free to let me know anything that should be changed :)

[TripleSpeeder]

PR is now rebased. I realized there was initially a change included on the snapshot.svg icon (removal of incorrect attribute data-stroke="none") which is not related to the cloning feature. I reverted that change with commit 14a6ec5 , but it looks like Travis is now choking on that commit, although from the error the build just seemed to time out? Travis log says

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

[TripleSpeeder]

Rebased again and cleaned up the commits a bit. Also MacOS build was successfull now, but I don't think this is related to my changes - must be some other change on develop branch that fixed it.

[RonSherfey]

requested changes