This fixes some vector overflows where the 4th element of a 3-element vector was accessed. The problem code wasn't used, so I simply deleted it. I also removed some other unused functions and added unit tests. I tried to only remove functions such that the compiler would catch any errors except that I removed operator= from etMat3 because it's only used in one place so it was easy to determine that it wasn't needed.
This fixes some vector overflows where the 4th element of a 3-element vector was accessed. The problem code wasn't used, so I simply deleted it. I also removed some other unused functions and added unit tests. I tried to only remove functions such that the compiler would catch any errors except that I removed
operator=frometMat3because it's only used in one place so it was easy to determine that it wasn't needed.Fixes #1934