Added some build automation

Apparently I've been using the wrong post type for every develop post...

It's been annoying me that deploying new builds to Itch takes so long (read: more than 10 minutes) which leads to me not pushing builds as frequently as I'd like. I fixed that with a simple Butler deploy script, so I'll be able to push new builds after each significant change; in less than a minute.

Also added some QOL things; like not duping items (heh) and esc closing other menus or opening the in-game main menu.