This replaces all of the Engineer's Melee_Allclass source animation files with new animations where he holds the weapon upright, making his melee_allclass third-person animations consistent with his viewmodel. Additionally, certain all-class melee weapons that were perhaps never enabled for Engineer due to clipping or animation concerns could theoretically be enabled for him. Of course it would still be up to Valve to decide whether to enable these for him, but I think at this point, the fact that Engineer can equip the Prinny Machete proves that a weapon doesn't need to be a repair/construction tool to be allowed as an Engineer melee.

Anyway, these animations all use the exact source names used in the Engineer's animations in DMX format, so the main step for Valve to implement it is replacing the source files. There are also about 11 lines of animation commands used in Engineer's source files that make sure his left hand grips the all-class melee while he's running and crouching - these need to be removed as well. This is something that would need to be done on Valve's end.

This also includes a modified viewmodel inspect animation, as the in-game inspect animation spins the weapon an extra ~90 degrees when Engineer compared to other classes' all-class melee inspect animations.

I'm submitting this as a separate V2 submission, separate from the original version, as the original submission is a trainwreck of instructions for Valve based on decompiled animation files, which aren't how Valve's animation source files are set up in the first place.