.pytool: Update CI Settings to support Emulator, ArmVirt, and Ovmf packages

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2570



Update pytools configuration to enable EmulatorPkg, ArmVirtPkg,
and OvmfPkg.

Update documentation for the status of those packages.
Remove future work items that are now complete.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

Reviewed-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>