Add release checklist

Hopefully this will remind me better. I am literally incapable of
remembering the brew file updates :(
Add support for deleting characters
Support for managing techs

Still some functions to add but seems pretty functional so far
Increase max stat/pixel vals again

Set it to max signed int, idk how much higher qt will allow (or Starbound)
Re-enable known tech hilight, fix some GUI stuff
Initial player rendering support, GUI tweaks
Prepare for release