Pretty complex change here: pending images/commands are now queued.
A command (like LED flasher) will not overwrite a pending image anymore. Also, sending multiple preloaded images is possible.
Also works (at least, as far as I could test) in combination with Multi AP and mirroring tags ('display a copy' content type).
It you want to test this: don't forget to upload the changed files in /www (the pending icon is now displaying the amount of queued messages). Timing improvements will follow later (only one message can be transmitted every checkin. If multiple messages are queued, at this moment, you have to wait until the next checkin which takes 40-60 sec).
This comes also with the advantage of better stability if you upload multiple images to the same tag in succession. Before queuing, if was possible to replace the image between sending the pending message and the image transfer to the tag, causing md5 mismatches and instability.
Solves #47
this file for combined flex pcb: antenna and connection between ESP32 S2 mini and tag, so it can be produced in one flex pcb.
combined file has been kinldy provided by 123tztz321 - thank you :)
- changed ESPAsyncWebServer and AsyncTCP (both not properly maintained for more than 5 years) to more recent fork with bugfixes
- fixed concurrency issues in /imgupload. Hurts the upload performance a lot, but probably that's not a real issue. Parallel uploads are now possible (still within the max 5 TCP connection limit)
- added short date format definition in language.json
- changed english date format to mm/dd
- added lightgrey (4)/darkgrey (5)/pink (6) colors in jsontemplate (uses pattern dither)
- fixed ntp init timing
