WIP: Refactor cdrdao toc/table functions into Task and provide progress output (#345)

* Begin work on moving cdrdao to a task

* Add code to start cdrdao task

* Allow cdrdao output to be asynchronously parsable

* Provide progress of cdrdao read toc/table to console

* Flake8 fixes, Freso's advices

whipper/command/cd.py

@@ -94,7 +94,6 @@ class _CD(BaseCommand):
         utils.unmount_device(self.device)
 
         # first, read the normal TOC, which is fast
-        logger.info("reading TOC...")
         self.ittoc = self.program.getFastToc(self.runner, self.device)
 
         # already show us some info based on this