Dynamic firms across multiple industries

[jdebacker]

This PR changes the model to allow for firms that own their own capital and face capital adjustment costs, but who also differ in the production goods they produce.

This PR will address Issue #406 and #332. It will replace PR #457.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.35%. Comparing base (3d638e8) to head (97e299d).
Report is 5 commits behind head on master.

❗ Current head 97e299d differs from pull request most recent head 0ce39d8. Consider uploading reports for the commit 0ce39d8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #874      +/-   ##
==========================================
+ Coverage   79.84%   80.35%   +0.50%     
==========================================
  Files          19       18       -1     
  Lines        4506     4158     -348     
==========================================
- Hits         3598     3341     -257     
+ Misses        908      817      -91     

Flag	Coverage Δ
unittests	80.35% <100.00%> (+0.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ogcore/firm.py	97.53% <100.00%> (+0.18%)	⬆️

... and 13 files with indirect coverage changes