Added 180 degree euler bend pcell

[ejonkerUBC]

• variable effective bend radius and Euler-parameter 'p'

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.50980% with 39 lines in your changes missing coverage. Please review.

Project coverage is 73.53%. Comparing base (5c5b632) to head (c87ceeb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...EBeam/pymacros/pcells_EBeam_Beta/euler_bend_180.py	74.50%	39 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
- Coverage   75.02%   73.53%   -1.50%     
==========================================
  Files         103      104       +1     
  Lines       12471    12626     +155     
==========================================
- Hits         9356     9284      -72     
- Misses       3115     3342     +227     

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