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[Map Sweepers] L4D2 Weapon Upgrade Orders

Adds this addon as orders/stratagems that you can use in Map Sweepers. I did not make the required addon, I just added functionality that lets you use it in this gamemode. Any issues from it will likely carry over.

Adds laser sights, incendiary ammo and explosive ammo to your buy orders. See mentioned addon to know exactly how they function. (But it's pretty self explanatory anyways)

I am aware that there are upgrades for flaming damage and explosive damage, but this acts more as a temporary boost as opposed to a permanent (one life?) upgrade.

Credits:
JonahSoldier & MerekiDor - Map Sweepers Gamemode
LemonCola3424 - L4D2 Weapon Upgrades Addon