Tools: DFG: Improve writing of Uart modules.
Tools: DFG: Add beautiful printing of Registers.

Example:
 Register: UEINTX
+--------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+
|   FIFOCON    |    NAKINI    |     RWAL     |   NAKOUTI    |    RXSTPI    |    RXOUTI    |   STALLEDI   |    TXINI     |
+--------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+