DIST: fix requirements + manifest for pypi installation

[klauer]

Closes #59 🎆

1. Made our own release of pyPDB to pypi - https://pypi.org/project/epics-pypdb/ - had to rename due to a package naming conflict
2. Fixed manifest + install requirements
3. Released the latest version to pypi - https://pypi.org/project/pytmc/

pip install pytmc should work now...

[codecov-io]

Codecov Report

Merging #142 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #142   +/-   ##
=======================================
  Coverage   77.71%   77.71%           
=======================================
  Files          16       16           
  Lines        1880     1880           
=======================================
  Hits         1461     1461           
  Misses        419      419

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[n-wbrown]

👍