FaML function and tests

[lukasc-ubc]

• new PCell GSiP.FaML_Si_1550_BB, for a facet-attached micro-lens
• new function SiEPIC.utils.layout.FaML_two() to create a facet-attached micro-lens array (two channels), with test labels
• new layer BlackBox
• new unit test for the function and PCell
• fix WAVEGUIDES.xml, by adding DevRec layer to Strip waveguide

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 21.53%. Comparing base (b259f4a) to head (678ec01).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
klayout_dot_config/python/SiEPIC/utils/layout.py	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage   21.41%   21.53%   +0.11%     
==========================================
  Files          43       43              
  Lines       10988    11003      +15     
==========================================
+ Hits         2353     2369      +16     
+ Misses       8635     8634       -1     

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