TransformerViewer U1.4 Modular

Required libraries:
- ProjectUNION Core 0.3.1
- ProjectUNION MQTT 0.3.1
- PubSubClient
- INA226

This project must not require:
- ProjectUNION DCC
- NmraDcc

Test:
1. Compile and note program and RAM size.
2. Upload and verify existing configuration is preserved.
3. Test all four INA226 channels.
4. Test transformer configuration.
5. Test MQTT publishing.
6. Test both TransformerViewer A and B.
7. Test OTA.
