19th release - fixing stuff

This 19th release is fixing things that the last release simply got wrong, but the members of the community reported and are working as intended again. Release notes are:

• Bugfix: Reverting change to the size of the input buffer, as the 128 bytes buffer broke PS=1 responses.
• New setting added: A new setting for reboot detections cycle of HA. It turns out that in rare cases we do not see HA go offline, then turning off the feature should fix that. Default is detecting the HA reboot cycle.
• Bugfix: Now parsing of top topic when changed to something that contained a "/", like "Myhome/OTGW"
• Bugfix: Fixed version detecting in PIC hex files
• Added: version detection of pic banner in OT processing loop
• Removed: interface.hex and diagnostic.hex from the filesystem. For now included in the filesystem as hidden files, downloading, renaming, and uploading would make them visible again.

The major reason why this is released is to fix the "native" integrations of Domoticz and Home Assistant that use the PS=1 command. I didn't notice I broke it, because those native integrations are not what I use, MQTT integration is replacing the older native OTGW component. However for legacy support reasons I want to keep supporting them. You can even run the MQTT and native integrations in parallel, not sure why you want to but whatever you like.

As always, any suggestions, ideas, questions, pull requests, issues you find, please use GitHub. Or better just join the community on discord, there are always a few people that are willing to help you out.

New on the discord community:

• Smart Autotune Thermostat - a Home Assistant automation project to build an autotune thermostat for your heating system.
• CV tuning channels - with experts helping new users out to monitor, tune and improve their heating systems

Join thru this invite: https://discord.gg/mSQBYBMNRy