Siepic-ebeam-pdk

- fix location of CML file

- added Lumerical Layer Builder files for Applied Nanotools process for Si and SiN
- fix example Si + heaters
- added new Verification rules for checking that shapes are inside components
- fixed Lumerical INTERCONNECT library loading

- Some EBeam PDK components require KLayout 0.28. Added a dialog box.

- fix MZI example

- Added automated waveguide crossing
- Documentation buttons added to PCells: contra-directional coupler, taper
- Added Dream Photonics 1x2 splitter

- Compact model files moved to the Technology folder / CML
- Integration with OPICS
- Single source CML can be read by Lumerical and OPICS
- Contra Directional Coupler simulation