Non-Standard Comparison Operators

*COMPLETE:*

- Adding Visual Studio stuff to .gitignore.
- Defining comparison operators on Vector.
- Comparison operators must be enabled by defining
`MATHFU_COMPILE_WITH_NON_STANDARD_EXTENSIONS`

*INCOMPLETE:*

- Neon SSE implementation. I don't have the required knowledge to code
this or test this.
- I have corrected what looks like a false negative in
`RandomInRange_Test`.
- New random values (due to more preceding tests) have either exposed a
bug in the test, or exposed a bug in the implementation. Please
validate.