- Rename Multiply() to MultiplyGeneral().
- Rename MultiplyUnrolled() to Multiply() and make specializations static
  functions in MultiplyCls struct.
- Label local array aliases as aligned(64).
Add aligned(64) specs for local array aliases; use alias templates for Matriplex classes.
Follow up on changes in Multiply() function names.
Only run inversion tests on 3x3 matrices.