LEAT-EchoStar-Terminal Version 12.7.3-0

What's new?

• Add support for board Term 7.1

LEAT-EchoStar-Terminal Version 12.7.2-0

What's new?

• Remove USB SPEED option for both Term 6 & Term 7 (STM32duino USB SPEED has no support for these MCUs)
• Add Serial2 as HEADER_SERIAL for Term 7
• Add Term7_EM2050_Firmware_Uploader example