Make '<' and '>' show different z-levels on the overmap screen
Make debug menu "Reveal map" reveal different z-levels as well
Add level indicator to overmap screen
Added disassembly recipe for vacuum sealer
string input popup: Prevent junk (^, etc) from being added if backspace is hit
while line is blank.
Merge PR #1158 - fix backspacing in empty text fields
Merge PR #1151 - switching levels during map view