expand mpkg dependency resolution

[ZookaOnGit]

mpkg only warns if a package has a dependency that isn't installed
make it so mpkg installs the dependency if it can

[vadi2]

In my experience good or bad dependency resolution makes or breaks a package manager. Perhaps we can use some off the shelf library to help with this, just like with semver?

[vadi2]

Good idea from Discord - show dependencies for a package and if it exists on mpkg, also turn it into a link.