Rename the `CMake` folder

I use the cmdline a lot, and whenever I tab to try to auto complete CMakeLists.txt it stops at CMake thanks to this folder

Rename it, it contains toolchain files used to cross compile for the Raspberry Pi

This will probably also require you to update the paths in the pi-cross-compile pipeline task. It will also require you to modify the build_docker scripts and test them, so download WSL and Docker to verify that they still work.