Fixed animations not saving sometimes

Fixed the weapons being misaligned(this time for real)

Added the ability to stitch animations together(probably misspelled it as 'stich' tho)
Animations longer than 256 frames should now correctly load and save

Fixed Beast Claw animations not being converted due to a missing null check.

Appending to a string when saving was very slow. With StringBuilder it's now ~1000 times faster.
The weapons' rotation was off by a few degrees
The feet should look a bit better now
The Spine1 bone was in the wrong position and was distorting the area around the stomach

Fixed an issue, where combining converted animations with other animations, that have rotation in the RootRotY bone would cause the character to lean forwards/backwards.

Fixed master bone's position being on the pelvis rather than on the ground

Fixed shoulders and head not aligning correctly
Fixed mass converting not creating the output folder
Should work correctly on more animations now

Initial barely correctly working build. Probably still contains lots of bugs. Be on the lookout and check your converted animations in havok tools!