Release v2.0-pre2.

Major Changes:

- Fixed BJT footprint

- Added ESP-32 WiFi module

- Shifted microcontroller + relevant circuity to optimize ESP-32 placement

- Removed microcontroller external crystal

- Reduced size of HV supply output capacitor

Current feedback loop is fully functional.

This allows the controller to work with almost any tube, and have them work at almost any brightness. Especially for larger tubes, this will ensure that all digits remain at the same brightness and reduce uneven cathode poisoning. No external resistors needed.