Optimized bitfieldReverse
Optimized bitfieldReverse
Added bitcount/pop implementation perf tests
Optimized bitCount function
Reorganized change list
First draft of GTC_round
Initial std trivial experiments #263
More std trivial experiments #263
More constants related to pi
Much more precise fastCos and fastSin

fastCos and fastSin had a max error of ~0.2 on [-pi pi].
The updated version is ~0.000007.
rename three_half_pi() => three_over_two_pi()
branchless wrapAngle
performance test for glm::fastCos
test perf fastSin
test perf fastTan
test perf fastAcos
test perf fastAsin
test perf fastAtan
rename some vars
All *vec* types are copyable #263