Missing `myproject_` prefixes?

[dabrahams]

These seem to be declared differently than other CMake functions in the project:

1. run_vcvarsall
2. download_cpm
3. contents of cmake/SystemLink.cmake
4. contents of cmake/Utilities.cmake

I can imagine a rationale for some of these, but it's not clear that it's done intentionally. Worth a look I think.

[lefticus]

Thanks @dabrahams , I'll take a look