Complete Simbeor channel solving, by accommodating remaining channel types.

[capn-freako]

Currently, the Simbeor channel solver is assuming single-ended microstrip and ignoring the user's selection of Channel Type.
Fix this, by adding support for the remaining channel types.

Related issues:

• Achieve first interconnect solve w/ Simbeor. #61
• Tx parasitics ignored when using an imported channel model. #60
• Make new channel cross-section drawing correct for different channel types. #62