Refactor RV32I code, add RV32I tests, update Makefile, cleanup code

[lachlanharrisdev]

Notable changes:

• Replaced riscv32i with rv32i in function names to standardise the formatting
• Split syscall handling into helper functions
• Refactored memory r/w functions
• Added test_riscv32i.c for basic test cases
• Removed deprecated test cases in test_utils.c
• Update .gitignore to include files for the future LaTeX paper

Description

This PR refactors a lot of the "messy" code from the previous release, and overall increases the stability, effiency & devops throughout

Checklist

Please ensure the following before requesting a merge:

• I have read and agree to the repository's CONTRIBUTING.md and LICENSE.md.
• All tests pass locally (make, make test).
• Relevant documentation has been updated (README.md, GitHub wiki(s)).
• Code follows the repository's style and formatting guidelines.
• I have added/updated relevant tests.

Related Issues

None provided.

Additional Notes

None provided.

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