Add a generator for capacitor networks.

Created by: Doeme

This is basically just a copy of the R_Networks code, with some minor (i.e. drawing capacitors instead of resistors) and sedding s/resistor/capacitor/g.

It spans the following types:

• C_Pack: Multiple capacitors in one package
• C_Network: Multiple capacitors with one lead in common

It is still lacking the proper footprints though.

Here's an example of one network (or rather pack)