Entropy function rewrite

[phillf]

Is your feature request related to a problem? Please describe.
Currently there are multiple entropy functions sprinkled throughout the codebase. This creates a situation of difficult to maintain code and can also introduce the potential for security vulnerabilities. The potential for vulnerabilities comes from the differences in each function.

Describe the solution you'd like
Unified global entropy function.

Describe alternatives you've considered
There are no alternatives to this. Centralizing and strengthening the entropy function is vital to security and maintainability of code.

[phillf]

@ItsAGeekThing has indicated they are going to hold this back until after the release of 1.0.