Add utility functions, implement memory handling, add initial tests

[lachlanharrisdev]

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[Copilot]

Pull Request Overview

This PR adds core utility functions and memory management capabilities to what appears to be a virtual machine implementation, along with initial test coverage. The implementation includes memory-mapped I/O handling, input buffering, and endianness conversion utilities.

• Implements utility functions for sign extension, byte swapping, memory operations, and input handling
• Adds memory and register definitions with proper hardware abstraction
• Introduces initial test coverage for the utility functions

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/test_utils.c	Comprehensive test suite covering utility functions and memory operations
src/utils.c	Core utility implementations including memory I/O, input buffering, and mathematical operations
src/main.c	Integration of utility functions and setup initialization
src/hardware.c	Hardware abstraction layer with memory and register definitions
include/utils.h	Function declarations for utility functions
include/hardware.h	Hardware constants, enums, and external declarations
Makefile	Build system updates with test target and improved compiler flags

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