Add support for 'png begin' and 'png end'

[geekykayaker-anon]

I have an Ender3 V3 KE, with testing I've found that the display will show thumbnails if the text "png begin" is used, but NOT if the text "thumbnail begin" is used.

I've changed my slicer to use "png begin" but now moonraker can't detect the images...

Can we add support for both specification of png thumbnails?

[Arksine]

Hi. Moonraker supports the standard thumbnail format generated by PrusaSlicer and its derivatives. These thumbnails are already PNGs. It sounds like the software driving the display is deviating from the standard and should be corrected to use the normal thumbnail identifier for PNGs.

Further, Creality is not in compliance with Moonraker's GPLv3 license, along with other software in the Klipper ecosystem including Klipper itself. Until they correct this, my policy to to avoid adding support specific for Creality hardware and/or software to Moonraker.