build: change third party into a repo system

[localcc]

Description

This uses the xmake repository system which is the correct way to have packages inside of a project, allowing us to depend on those packages in other packages as well as improving package xmake.lua change detection.

Type of change

• [x] Other... Please describe: Third-party structure change

How Has This Been Tested?

Building the project with new changes after cleaning everything including xrepo using xrepo remove --all -y

Additional context

Some packages that write their own xmake.lua were not able to depend on other packages we've defined ourselves because of it not being a repository, this PR fixes that.

[localcc]

as usual this blew up on linux because of casing