Add more detailed docs for building cmake-based AFDKO from source

[iterumllc]

Description

The Antlr 4 Cpp runtime adds a guid/uuid to some elements of its parsers. It can satisfy that dependency with built-in parts of macOS and Windows but on other OSes libuuid and its headers must be installed (it uses pkg_check_modules(UUID REQUIRED uuid) in CMakeLists.txt on Linux).

This is effectively another "build tools" requirement and will already be satisfied on many systems, but some users will need to install an extra package or, possibly in rare cases, install libuuid from source. This PR adds some documentation to that effect. There's also some doc cleanup here and there.

Checklist:

• I have followed the Contribution Guidelines
• I have added test code and data to prove that my code functions correctly
• I have verified that new and existing tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[kaydeearts]

👍 Looks good!

[josh-hadley]

👍