As part of resolving a resource, record its MD5 hash in the output
metadata. In order to enable this, resource resolution is now done via
the context, rather than directly via the ResourceResolver (in order not
to introduce a context dependency in the Gui object, context now
emulates the resolver interface).
Update workloads that allow for specifying which cpus to be ran on to
all use the same interface while maintaining backwards compatibility with
the existing configuration options.
