Being 90% spy, the stuff deserves more than that to me

Added a backstab custom death animation to the Heavy.
Fixed Spies not being able to sap a building if an enemy player was colliding with the building.
Fixed getting a real target ID on an enemy Spy that's disguised as one of your teammates if you are disguised as an enemy.
Fixed the Ambassador not shooting enemy sticky bombs.
Fixed Spies being able to automatically cloak after uncloaking at the moment of a weapon switch.
Fixed a couple of cases where viable backstabs would fail.
Heavy backstab animation is awesome - really shows when you finally take out the big bullet blaster.
They finally fixed the building collision thing, that really annoyed and confused me sometimes.
Didn't notice the next three things to be honest.
I only got 1 failed backstab due to the last bug, it's good but not huge.
Overall, not a big deal but nice to know that everything is keeping up to the standard.