Mouse support

[tobimensch]

I can imagine that many will be against this feature, because they may ask why you want that with a keyboard driven editor like moe.

My counter is: why not? Vim also provides it, and from what I can remember it's not even that hard to support in the terminal.

Basically you should be able to use the mouse to move between split windows and to set the cursor position.

It's not a high priority for me either, but still should ultimately be supported.