Siepic-ebeam-pdk

fixes

- bug fixes: fix for Monte Carlo with the shortened spice netlist feature.
- support for different pin lengths

- fix for ebeam_dc_halfring_straight_te1550
- implemented load updated netlist into INTERCONNECT
- Spiral PCell
- ring resonator layout test structures

- Implemented Shortened spice file generation
- updated SWG edge coupler
- add SWG PCells
- Verification menu update
- CML update, dc_halfring_straight

Minor fixes in:
- waveguides
- Monte Carlo

- Monte Carlo histograms generated by INTERCONNECT, added in KLayout GUI.
- Check waveguide first/last segments if they are manhattan
- INTERCONNECT path check
- extra FDTD simulation projects
- SWG edge coupler gds

- fix for Object Snapping bug: math rounding error