This will un-break examples that got confused by the presence of
two Nordic UART Services. It also adds a version characteristic
that gives the CircuitPython build tag back.
Fixes#5252
Call `supervisor.disable_ble_workflow()` and the BLE workflow will
be disabled until the chip is reset.
This also includes a couple fixes:
1. Terminals can now be deinit by setting the tilegrid to NULL. This
prevents using the tilegrid before display is init.
2. Fix BLE serial send amount when sending more than a single packet.
Fixes#5049
Scott Shawcroft