ARM: prepation for Tx hardware lib
- wrapper for TxSoftwaree or TxHardware lib in namespace Serial
ARM: TxSoftSerial framing error solved
- decrease all IRQ priority to 1 except for TMR2_IRQn which stay to 0
ARM: TxHardSerial first working version
- #define TX_HW_SERIAL => enable hardware uart
- #define TX_HW_SERIAL_PIN 7|38 => Tx pin can be set on pin 7 or 38