New Features and Improvements

• #188 configure and install cglm.pc with cmake ( thanks to @wdouglass )
• minor doc impovements ( thanks to @ylecuyer )

• rename glmm_shuff1x() to glmm_splat(), mark glmm_shuff1x() as DEPRECATED
• optimize translate functions with FMA and NEON
• use unified glmm api for vec4
• arm: define CGLM_ARM64 for identify arm64
• arm: optimize vec4 div with NEON
• arm, neon: implement mat4 determinant with NEON
• arm, neon: implement mat4 inv with NEON
• arm, neon: update mat4_mul to use FMA
• arm, neon: neon/fma support for glm_mul()
• arm, neon: neon/fma support for glm_mul_rot()
• arm, neon: neon/fma support for glm_inv_tr()
• arm, neon: neon/fma support for glm_mat2_mul()
• arm, neon: neon/fma support for glm_quat_mul()

New glmm functions:

• glmm_set1(x)
• glmm_splat_x(x)
• glmm_splat_y(x)
• glmm_splat_z(x)
• glmm_splat_w(x)
• glmm_xor(a, b) for neon
• glmm_vhadd(a) for neon