Add timeouts to all gRPC remote calls and bump yagrc package requirement to a version that does same for the reflection service, as well as fixing a state issue around failed lazy import resolution.
This should address the script hang symptom on issue #36.
Add a new command line script, dish_obstruction_map.py, that writes a PNG image based on the obstruction map data queried from the dish.
Supports color or greyscale output and either with or without alpha channel.
Does not yet support running in an interval loop, mostly because that will require templatizing the output filename in order to be useful.
Tracked on issue #27
If the spacex grpc modules are not available in the import path, will now fall back to using reflection to get them dynamically. I'm not real happy with the mess this made of the import lines, though (and neither is pylint...), so I may hack on that a little further when I get the time.
Add a requirements.txt file to enable installation of all prerequisites so users don't have to follow the individual instructions for each dependency package. At some point, I'll really need to add proper Python packaging so the whole thing can just be installed via pip.
Rearrange the README a bit, since some of the sections have increased or decreased in relevance over time.
