Add a C99 backend #32

Describe the feature

Add a C99 backend to V. This will translate V code to C99 code.

Use Case

This feature would be useful for platforms that lack a newer C compiler than C99. This possible backend could expand V's reach into more systems.

Proposed Solution

C11 features that are used in V like atomics could be translated into older APIs like POSIX's mutex.

Other Information

No response

Acknowledgements

• [x] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

Version used

v 0.5.1

Environment details (OS name and version, etc.)

This information isn't needed.

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