Allow CORS from localhost by default (#197)

[dionhaefner]

Works in Firefox, Chrome, Safari

[codecov]

Codecov Report

Merging #236 (fd8543d) into main (9bd5873) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files          45       45           
  Lines        2251     2253    +2     
  Branches      287      288    +1     
=======================================
+ Hits         2219     2221    +2     
  Misses         18       18           
  Partials       14       14           

Impacted Files	Coverage Δ
terracotta/cache.py	100.00% <100.00%> (ø)
terracotta/config.py	100.00% <100.00%> (ø)
terracotta/server/flask_api.py	90.54% <100.00%> (+0.26%)	⬆️

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