Various typo fixes (mostly undefined vars)

[filloax]

Fixed various typos that used undefined vars in some parts of code, the one in save loading might have had more reaching consequences? Or just minor, idk

Some doubts left:

Unsolved issues (missing knowledge):

callbacks.lua:

• line 591: uses extraRoomBaseType but that is not defined here, what was that meant to do?

Doubts:

customFloorGen.lua:

• line 617: noInterference not defined, was that supposed to be an arg? Assumed so and added it