Remove wa.framework.plugin.Artifact and associated references. The name
of the class clashes with the class from output and can potentially
cause confusion.
The original intention for this was to be an "expected artifact
descriptor" of sorts that plugins can specify for validation purposes,
but that functionality was never implemented. Given that the framework
has undergone significant changes since this was implemented, it's not
clear that this is the best way to go about the original goal.
Therefore remove this for now.
Seem I cherry-picked the geekbench workload from my WIP branch
without testing properly, and missed a fixup commit. Here's the
content of that commit, which fixes some missing updates from WA2 ->
WA3 APIs.
Differences from original:
- Standard renaming and rearrangement of imports
- UiAutomation.java now uses the setup() and runWorkload() phases which weren't
present before.
