SiN gc cleanup Bobby

[Hang-Bobby-Zou]

I have cleaned up my design for the SiN 1310 TE GC and added documentations to the folder I have also added a component of a spiral SiN to the beta library, only changed layers and some default parameters

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.14286% with 26 lines in your changes missing coverage. Please review.

Project coverage is 73.49%. Comparing base (ada3345) to head (1e5c27c).

Files with missing lines	Patch %	Lines
...out/EBeam/pymacros/pcells_EBeam_Beta/spiral_SiN.py	83.00%	26 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #298      +/-   ##
==========================================
+ Coverage   73.35%   73.49%   +0.13%     
==========================================
  Files          96       97       +1     
  Lines       11706    11865     +159     
==========================================
+ Hits         8587     8720     +133     
- Misses       3119     3145      +26     

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