[BUG] find_package code paths fail to return status

[osayamenja]

Bug

Set CPM_USE_LOCAL_PACKAGES and call CPMAddPackage(...) for a local package, this path gets called, but after return() all the exported env variables are lost and are not available in the parent scope.

PROPAGATE is one way to address this.

Asks

1. If you call CPMFindPackage(...), no status-like variables such as FOUND or ADDED are returned. It would be nice to maintain the same functionality as CPMAddPackage by returning those status variables.
2. I get warnings about CMP0144 when using CPM, can we set this policy?