REPL from Unity editor's UI window rather than in game UI.

[josephan]

Hi @hecomi ,

Thank you for creating uREPL, it's incredible. It helps me experiment and iterate more quickly.

Is it possible to have the REPL run in Unity editor's UI so it can be docked on the side? This can improve user experience as uREPL can fill up the entire screen and can accidentally hijack mouse or keyboard input. If this is possible and your willing to accept PRs, I'd love to contribute.