Firmware upgrade: version 1.17

[Vectrex32]

There's a new version of the Vectrex32 firmware available: version 1.17. (Version 1.16 was never released.) Version 1.17 includes new features, optimizations, and bug fixes. If you already own Vectrex 1.10 or newer, you can download the firmware here. If you still have version 1.00, please read this.