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
Fixed build
Fixed glm::mask function and tests
Fixed distance function return type #267
Merge more precision for fastCos and fastSin #264
performance test for fast_trigonometry #265
Added a CMake option to execute GLM performance tests. Made quat and dualquat trivially constructible #263
Move more performance tests inside GLM_PERF_ENABLE
Added dualquat trivially copyable test. #263
Clean up white spaces