Extra sizes U8320 and U12288

[Fethbita]

Adds U8320 and U12288 and a way to split U1152 U2176 U3200 U4224 U6272 and U8320 into U128.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.25%. Comparing base (d01e188) to head (372c27b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1101   +/-   ##
=======================================
  Coverage   79.25%   79.25%           
=======================================
  Files         177      177           
  Lines       18076    18076           
=======================================
  Hits        14327    14327           
  Misses       3749     3749           

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