Create: Power Grid

This is a beta release, issues might appear especially with the new stuff.

• Added the Native Solver Backend (accelerated solving, a bit experimental)
• Greatly improved the behavior of "splitting transformers"
• Improve diode convergence again
• New servo and motor models (Da-Negy)
• Increased max relay coil voltage
• Added vertical resistors and diodes
• Optimized some more stuff
• Registered the basin heater as a boiler heater
• Added double pole relays
• Added Static Induction Transistor (item sprite by casvara)
• Added NPN and PNP BJT Transistors (item sprites by casvara)