Source Code Hardening

[ryantxu1]

Collection of Source Code Hardening Techniques (address #165). Credit to @rafikap his hard work in producing the majority of this content!

Still a WIP - TODOs:

• Consider if d3f:DeadCodeElim belongs to Source Code Hardening
• Need Data Type PR to merge to add better data artifact relationships in input validation/sanitization
• Consider if the 'Least Privilege Access' concept is captured by 'application configuration hardening'
• Consider how to add a technique on HTTP Request Uniqueness Validation (nonce)

[netfl0]

When you can, please confirm what else needs to be done.

[aamedina]

Fuzzing may sometimes be used as Source Code Hardening: https://github.com/d3fend/d3fend-ontology/issues/303