Fix quat packing XYZW usage

[stephomi]

Round number 2 because I'm 100% sure the code is broken at the moment.

I don't care about the default by the way, my code works no matter the packing.
But OK, I'm assuming the default behaviour should be packed as XYZW and ctor as WXYZ (I guess that's the only thing people care, @xiaozhuai, @gottfriedleibniz)

The problems are still there:

• QUAT_DATA_XYZW does nothing right now, see the code in type_quat.inl (and it does nothing in type_quat.hpp)
• If you want to keep QUAT_DATA_XYZW then it should be renamed QUAT_CTOR_XYZW imo (also, do we really want to keep this flag)?
• decompose is 100% broken no matter what, it reads the ctor flag (_XYZW) instead of the packing (_WXYZ)
• same for type_quat_simd.inl

[stephomi]

Unrelated but I believe it should be #if __cplusplus < 201103L or #if __cplusplus <= 201103L in hash.pp.
Currently it spams warning on modern compilers.

[christophe-lunarg]

It seems to me that accepting these PR introducing these GLM_FORCE_QUAT__ was just entering a rabbit hole... that didn't matter. Anyway, thanks for the PR, sorry for the too quick answer for the previous PR, I hope this PR brings closure of this topic but I have doubt about this..