Remove dev-cli and dev-tools directory

[jeromekelleher]

It's not really used any more and covers only a very limited amount of the API surface. It's not worth keeping it maintained IMO.

Does anyone else use it?

[benjeffery]

I've never touched it - was the idea to have a python free CLI?

[jeromekelleher]

Originally it was a way to run stuff without Python so I could use valgrind. But, the tests have got so much better now that there's no real purpose any more.

OK good, let's nuke it.