Major/core rewrite

[jagerber48]

Add core.py which

• re-implements AffineScalarFunc as UFloat
• re-implements the uncertainty linear combination tracking of uncertainties
• re-implements linear uncertainty error propagation on UFloat operations
• re-implements numerical and analytical derivative calculation for UFloat operations

[codecov]

Codecov Report

Attention: Patch coverage is 91.74603% with 26 lines in your changes missing coverage. Please review.

Project coverage is 95.68%. Comparing base (4a470e4) to head (b277ab4).

Files	Patch %	Lines
uncertainties/core_new.py	88.42%	25 Missing ⚠️
uncertainties/umath_new.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   96.33%   95.68%   -0.65%     
==========================================
  Files          15       18       +3     
  Lines        1909     2224     +315     
==========================================
+ Hits         1839     2128     +289     
- Misses         70       96      +26     

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[jagerber48]

Oops, I meant to put this as a PR within my fork so as not to spam everyone with updates, and because It's not clear if/how any of this will ever be merged into uncertainties or if it is just discussion fodder. Unless folks want me to keep this PR open here I'll close it tomorrow or the next day and re-open within my fork.

[jagerber48]

Moved to jagerber48#2