Various fixes. DJ with vm library can run normal WuKong application again, but the build system isn't perfect (not sure why I need to include wkcomm in app/wkdeploy/build.xml, but not uart)
"wkpf" library currently still depends on "vm". This should be split into a base "wkpf" and "wkpf-virtual" library, with the second containing all code needed for running virtual wuclasses.