Refactor math support routines to use glm

[XenonofArcticus]

1. Add #ifdef support within our homegrown math routines to internally use glm code as an implementation, but keep the same homegrown calling API and types.
2. Use conformance and performance tests to validate identical or superior operation
3. Refactor the actual DEFG code to use GLM types and methods directly
4. Remove homegrown math code