New: vttest 20190710

[Brian Inglis]

The following packages have been uploaded to the Cygwin distribution:

* vttest-20190710-1

Tests the functionality of a VT100 terminal (or emulator thereof).
Tests both display (escape sequence handling) and keyboard.
The program is menu-driven and contains full operating instructions.
To run a given menu-item, you enter its number. You can run all
menu-items (for a given level) by entering an asterisk, i.e, '*'.