First release that works.

Adds:

• Resistor (with configurable GUI for resistance)
• Wire
• Voltage Source (with configurable GUI for voltage) - an ideal DC voltage source.
• Ground Pin
• Capacitor (with configurable GUI for capacitance in Farads)
• Inductor (with configurable GUI for inductance in Henries)
• Diode
• 12v Battery (acts like a voltage source)
• Solar Panel (acts like a voltage source)

Only supports placement in the horizontal plane for now, some connectivity issues and bugs still to be worked out.