python: major rewrite with more full-featured edge node examples

Includes:
- packaging config using setuptools
- regenerated the pb2 files with the current protobuf definition and libprotoc 3.6.1
- convert all tabs to spaces
- beautify all code according to PEP8
- updated examples to match new usage

python/.gitignore

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+build
+dist

python/README.md

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+Add in "function annotations" or use "typing" module?
+
+https://docs.python.org/3/tutorial/modules.html
+
+# Python specific hints and tips
+
+Basic instructions used to setup Python packaging found here: https://packaging.python.org/en/latest/tutorials/packaging-projects/
+
+## Building PIP package
+
+From in the `python` directory:
+
+```
+python3 -m build
+```
+
+## Install PIP package locally for testing
+
+From in the `python` directory:
+
+```
+python3 -m pip install .
+```
+
+## Recompiling protobuf definition
+
+From the top directory of tahu:
+
+```
+protoc -I=sparkplug_b --python_out=python/core/tahu sparkplug_b.proto
+```
+

python/core/.gitignore

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+*.egg-info