Add alignment, SM_INLINE, OpenMP and GLFW example support

[joneqdaniel]

• explicitly force inline using SM_INLINE with (always_inline,flatten,nothrow) inline
• align Vec to N * alignof(T) if N==std::bit_ceil(N) otherwise use default alignof(T)
• strip binary if CMAKE_BUILD_TYPE != Debug
• add OpenMP support
• add SSE compiler option on AMD64
• add GNUInstallDirs and FindPkgConfig for non MSVC
• add test case for alignof(Vec3) and alignof(Vec4)
• add AVec3 and AVec3d
• add sincos constexpr
• add position() and direction() to Vec with N = 3
• add GLFW example support
• add GLUT example support