DSC Classic series support testing/feedback
Support for DSC PC1500/PC1550 is now in `develop` - this uses the same interrupt-based data capture as the PowerSeries, and like [dougkpowers/pc1550-interface](https://github.com/dougkpowers/pc1550-interface), requires configuring the panel PGM in PC16 mode.

Most sketches are supported and require minimal changes, excluding `TimeSync-NTP` (should be possible to support) and ~~`Unlocker` (likely will not be supported as there is very little data feedback on the Classic series Keybus).~~ Edit: `Unlocker` now supports Classic series (2024.03)

Post results from testing/feedback here - if you have a PC2500/2550/3000 panel, data captures from `KeybusReader` would be useful to see if support for these panels can be added.

