Refactor - Refactor linear algebra structure.

[james-d12]

Refactor the structure of the linear algebra code to be more like

.
├── arithmetic                  # Contains arithmetic functionality like addition, subtraction ,etc
├── algorithm                  # Contains algorithm based functionality like searching / sorting.
├── detail                         # Contains detail based functionality for internal use.
├── utility                         # Contains utility functionality.
├── vector                        # Contains vector functionality.
├── matrix                        # Contains matrix functrionality.