Bring back xmmv

[ralsei]

sxhkd no longer supports the feature that replaced xmmv, so it's needed again.

It'd also be nice if you could resize windows w/ xmmv, albeit that might be asking too much.

[greduan]

What was that feature? Just curious.

[lwilletts]

It's a C program that allows moving of a window with the mouse. I've created #12 to add the latest version (known to me) written by dcat back into opt.

[greduan]

Ah I see. Cool

[z3bra]

Fixed as per commit a84e338.