* Changes UART ISR to only trigger on RX FIFO Full and timeout

* changes initial RX timeout

* Eliminates extra testing for _uart != NULL

* reconfiguration with "uartSetFastReading()"

* Adds new function "uartSetFastReading()"

* changed default onReceive() behaviour

* forces User callback in case of error

* Error Code Order

Set NO_ERROR as first error code, same as ESP_OK = 0