plugin.cpp, plugin.h: delayed initialization of VLC until activation in place in...

plugin.cpp, plugin.h: delayed initialization of VLC until activation in place in user mode only
    this allows the persistable properties to be fully loaded before initialization and allow
    for control to initialize faster in design mode. AUTOLOOP property now works properly
persistpropbag.cpp, vlccontrol.h: decoupled volume property from VLC so that value can be used
    without having VLC initialized
test.html: added volume control