mkosi-tools: Split off misc, package-manager and runtime profiles

mkosi-tools: Split off misc, package-manager and runtime profiles

Let's make the dependencies verb a little more flexible by splitting
off various profiles in mkosi-tools, the misc, package-manager and
runtime profiles. The misc profile contains all the useful tools we
install to make sure they're available in scripts. The package manager
contains non-native package managers and related tools. The runtime
profile contains all the tools required to boot images. The regular
configuration now only includes the tools required to build native images
with mkosi.

The default tools tree still includes both the misc, package-manager and
runtime profiles by default but the list of profiles can be changed with
the new ToolsTreeProfiles= setting. The dependencies verb includes neither
profile, but we now allow passing arbitrary settings to the dependency verb
as arguments so that packages from additional profiles can be requested if
needed.