Teach find_package to search a "package registry"
A common user workflow is to build a series of dependent projects in order. Each project locates its dependencies with find_package. We introduce a "user package registry" to help find_package locate packages built in non-standard search locations. The registry explicitly stores locations of build trees providing instances of a given package. There is no defined order among the locations specified. These locations should provide package configuration files (<package>-config.cmake) and package version files (<package>-config-version.cmake) so that find_package will recognize the packages and test version numbers.
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