A MQTT-Controlled Display with 2 Lines

Hardware: - Arduino UNO (First Tests) - ESP32 DEVKITV1 (Final) - 4x Sure Electronix LED Matrix Displays DE-DP14112

About the serial interface:

    First Byte is the Command:
    L<num>      Select Line <num>
    S<Text>     Sets the Text directly on the selected Line
    A<Text>     Appends the Text on the selected Line
    I<num>      Prints debug info of Line <num>
    C<num>      Clear Line <nun>

    Possible control-codes in the Text:
    \g      Select color green
    \r      Select color red
    \o      Select color orange

        NOTE:
        When using "S", the string is parsed from right to left! So the codes must then be BEHIND the text and with switched chars.
        Example: "This in REDr\This in Greeng\"

File information:

    MqttLauftext.ino        The main loop
                            Initialises the stuff, then read from serial in.
                            Serial Input will be replaced with MQTT

    TextHandling.ino        The handling of input strings
                            Input-Strings are parsed and with a FIFO the BitBuffer is filled with data. Basically a FIFO-Buffer for chars

    BitBuffer.ino           The bit buffer handling
                            The BitBuffer takes chars from the TextHandling, creates bit masks from the letters and creates the bitdata for the matrix display.
                            It can also autoscroll the lines if necessary (not used at the moment)                        

    HT1632.ino              The functions to control the HT1632 Controlles. Sending commands and data to them and stuff like that.

    ht1632.h                Some defines, mostly for the HT1632 Controllers. But also HW dependend stuff like number of display modules

    letters.h               The Letters for the Font from SPACE to '~'. 
                            The width of each char can  be different and is specified in the first value.
                            The Databytes are the bit values for each LED column