Alert users about ESP32 Specific Settings

[garthvh]

ESP32 Only Settings

• [ ] Config.Power.ChargeCurrent
• [ ] Config.Power.IsPowerSaving
• [ ] Config.Power.lsSecs
• [ ] Device.NtpServer
• [ ] ModuleConfig.Range Test
• [ ] ModuleConfig.Serial Plugin
• [ ] ModuleConfig.MQTT Modules
• [ ] Config.WiFi Settings

Users are setting wait_bluetooth_secs and is_always_powered on nrf52 devices where they have no effect, mostly in an effort to fix the broken t-echo.

It would be good if we could not set these values for nrf52 and instead tell the user they don't apply.