1.3.1

Persistent lives, fix gas bomb poison lasting forever

Campaigns

• Add accurate 1up powerup for wolf3d/SoD campaigns: add 1 life, 100 health, 25 ammo
• Add backpack powerup for doom

Game

• Fix gas bomb poison effect lasting forever
• Add life powerup, persistent lives #741
• Add support for larger-than-tile-size collisions #743
• Improve wolf3d setup by moving .wolf3d folder out of missions #746

Editor

• Add support for multiple pickup effects