Add trace logging around plugin calls

[thecybermind]

Add a trace level log entry for every call to p.QMM_vmMain, p.QMM_vmMain_Post, p.QMM_syscall, and p.QMM_syscall_Post in s_main_route_vmmain() and s_main_route_syscall()

Include name of plugin in logs, and for after the plugin returns, include return value, and plugin result.