Adds bezier vector lerp util function
Adds drawing of test ent in traversal editor
Adds framedefs for zombie lerp anim
Updates framedefs for zombie from removing frame 160
adds all the coding for MP5K
to note, some things like the spread, recoil and kick are copied from the MP40, so they may be inaccurate, and might need to be changed in the future
This rebrands the two under the "HANDHELD" name. The two platforms now
function identically in regards to server functions, making them
unified in behavior and general server-reliant functions.