build: 🔨 Rework Build System with Meson

[meisZWFLZ]

Overview

Old build system bad. Meson good.

Motivation

Makefiles are annoying to work with and the old makefile system did a lot:

• supporting hot/cold packages and monoliths
• supporting templates and user programs in the same makefile

Meson helps us by simplifying a lot of the work for the build system. It also simplifies adding new features like unit testing, precompiled headers, and unity builds.

Additionally, Meson provides tools for dependency management so we don't have to remake the wheel.

References (optional)

Resolves #10

Implementation Details (optional)

Test Plan:

• Get kernel to successfully compile
• Test that the kernel and a basic main.cpp works on robot
• Kernel compiling to a template
• Kernel template successfully compiles with user project
• User project works on robot