Add new Quat ctor from float4 and Quat::FromAxisAngle from float4. Optimize Quat::RotateFromTo by avoiding costly arccos computation and add a SSE implementation, improving old path from 88 nsecs to 20.197 nsecs (scalar) and 12.489 nsecs (SSE1).
Optimize Quat::SetFromAxisAngle for SSE (36.980 nsecs -> 26.856 nsecs).
Optimize float3 and float4 construction for SSE.
Micro-optimize Quat::Transform for float3s.