This commit clarifies some things in the docs based on PR review.
It also adds additional test coverage for managed dependencies;
specifically, a case where two normal dependencies both have
a transitive dependency on the same library, but with different
versions. The test validates that this conflict is properly
resolved via `:managed-dependencies`.
This commit adds some additional dependencies to the test project
file for managed dependencies, and significantly increases the
coverage of the tests.
This commit provides initial support for `managed-dependencies`,
where dependency version numbers may be specified in a separate
section called `managed-dependencies`, and those version numbers
will be used for any deps in the main `dependencies` section
that do not explicitly specify a version number.
This is a precursor to being able to specify a "parent" project
that could be used to consolidate version numbers of common
dependencies across a large number of libraries.
