PROT with 0 life doesn't die
Fix incorrect search page count
Ignore invalid walls in some old saves, so that they load correctly

E.g. save 10631 from old server
revert b17ef7f93880 (couldn't figure out better fix for the new PSTN bug), fix annoyance with clicking on save comments changing pages
fix not being able to select / see all elements in menus with tons of elements
fix bottom row of saves in the save browser being cut off
Merge https://github.com/simtr/The-Powder-Toy