v0.3.20
Updates:
- contraDC PCell
- New PCell to EBeam-dev: Period Chirped contra DCs
- Fix spiral waveguide PCell
- added 1310 nm waveguide
- added UGC (universal grating coupler) Pcell to dev library
- Calibre litho simulation layer
- ebeam_gc_te1550_broadband.GDS
- SWG rings, SWG_multibox_ring update, in EBeam-dev