Rory O'Connell

I'm sorry, there are commits in different places with different targets and I am getting confused. The design of Git doesn't help. I will sort it out.

Rebased from head of `docking`, looks like that sorted out any issues.

I'll open this up as ready for review as it works in a basic case without the extra platform features.

That diff applied cleanly and compiled without issue. Apologies for adding more work.

Bit more progress, hopefully less problematic with style issues. Added hiding the OS cursor. Using `xcb-cursors` it looks possible changing the OS mouse cursor reflecting the state of what widget...

Turns out you can control the X windows cursor! 

Whoops, didn't set the `HasMouseCursors` config flag, now it works properly  Next up, clipboard support is going to get interesting, it looks intensely involved on the X...

I don't have such dependencies on libraries like that. Before I started working on this I discovered [this comment](https://github.com/ocornut/imgui/issues/1194#issuecomment-309715962), so I thought I'd contribute back the work I'm doing based...

> Why? This is going off on a philosophical tangent now. I think you answered your own question. Introducing such libraries means you're married to them forever, better or worse....

I have an alternate idea. I can finish and make this up to standards, then instead pulling it into master we can leave it as a branch or put it...