compiler considers code in modules/packages to be standard modules

[mppf]

Currently, the compiler applies MOD_STANDARD to code parsed from modules/packages. This means that this code isn't being checked with unstable warnings and a variety of other checks. At the same time, since modules/packages can be viewed as a place for code that could be mason packages but that is bundled with the release, it's more appropriate to label it with MOD_USER than MOD_STANDARD.

This issue serves as a place to track the TODO of resolving this issue and to discuss.