Using Serial ports > 3 on Teensy boards

[bazmonk]

I have been using the Trigger (and Tsunami) with Teensy3.5+ boards, which support upwards of 8 UART serial ports (https://www.pjrc.com/teensy/td_uart.html). I'm also using the USB Host feature of the Teensy units.

• Using the Serial ports above 3 was easy. In the header files:

#ifdef __WT_USE_SERIAL4__
#define WTSerial Serial4
#define __WT_SERIAL_ASSIGNED__
#endif
#ifdef __WT_USE_SERIAL5__
#define WTSerial Serial5
#define __WT_SERIAL_ASSIGNED__
#endif
#ifdef __WT_USE_SERIAL6__
#define WTSerial Serial6
#define __WT_SERIAL_ASSIGNED__
#endif
#ifdef __WT_USE_SERIAL7__
#define WTSerial Serial7
#define __WT_SERIAL_ASSIGNED__
#endif
#ifdef __WT_USE_SERIAL8__
#define WTSerial Serial8
#define __WT_SERIAL_ASSIGNED__
#endif

• The USBHost_t36 library for Teensy (https://github.com/PaulStoffregen/USBHost_t36) also uses an EOM variable. To make the Trigger/Tsunami work alongside I renamed the EOM variables in their libraries to EOMWT and EOMTS, respectively.

So... no issue here. I'm curious if you want either of these as pull requests.