Initializes the plugins for this resource manager.

def init(self):
        """
        Initializes the plugins for this resource manager.
        """
        # import any compiled resource modules
        if not self._initialized:
            self._initialized = True
            wrap = projexui.qt.QT_WRAPPER.lower()
            ignore = lambda x: not x.split('.')[-1].startswith(wrap)
            projex.importmodules(self.plugins(), ignore=ignore)