Incorrect last safe pos when level is initially started

[aglab2]

gMarioStates->lastSafePos is not being recorded when level is started because step is not actually happening till Mario moves. This can be abused to do wrong warps.

elysium-idea1.mp4

[gheskett]

In addition to updating safe pos with these types of movement, it would probably also make sense to set it to the floor position of the destination warp object upon spawning/warping Mario.