Umesimd integration
This change introduces new vectorization backend using UME::SIMD library. There are still few things in the code that I want to change, so this is not an immediate merge request.
Since I am new to the project, I would like to get some feedback on:
- coding rules
- predicate correctness in volume implementations
- whether build system can be broken for any build configuration
UME::SIMD can be found at: https://bitbucket.org/edanor/umesimd/overview Please use the most recent stable release.