Trying to make the game not run like shit

There's a vector that I'm storing all the indexes for bullets that are
on screen, and I'm trying to figure out a streamlined way to delete them
from the vector once the bullet itself is gone.  At the moment it's
slowing the game down A LOT.
Revert "Trying to make the game not run like shit"

This reverts commit 25c4878ea9db86c10e5c58724093608f60cac6ef.
Game runs poorly, fixing it

Read the description for "Trying to make the game not run like shit".