Improved resistor and capacitor code for better performance and numerical correctness.

Implemented Euler method for the capacitor

Fixed missing file issue, minor improvements

Improved capacitor algorithm to support a square-wave input (still under work)

Initial testing with an RC circuit

Compute the sweep taking into account actual elapsed time.

Handle smooth immediate up/down sweep

Added sweep generator, with working prototype

Added Capacitor with correct charging, further transient support is needed.

fixed bug where an exra resistor was calculated, VS bug still present

working basic solver: todo source current is still incorrect

working circuit with source resistor and ground

working variable number of ports, each of 4 connections per component

functioning auto-name with 4 I/O ports per component

Initial commit: