Merge changes from topics "b194781951-flags-5", "b194781951-flags-6", "b194781951-flags-7", "b194781951-flags-8" into sc-v2-dev

* changes:
  5/N Remove PluginInitializer entirely.
  4/N Remove #handleWtfs from PluginInitializer.
  3/N Remove #getPrivilegedPlugins from PluginInitializer.
  2/N Rename PluginInstanceManager to PluginActionManager.