[Cin] Monthly AppImage updates

[Phyllis Smith]

Despite the potential for problems, late checkin of changes, and not too
much testing, a new set of AppImages is now available for download.  As
always, if problems, simply revert to the previous AppImage.  Changes
includedare listed below.
******************************************************
*Mirror* is a new user contributed new video plugin and has been documented
in the Manual.
*Gain *audio plugin has been improved to include the text box for precise
designation of the gain and the clear/reset button to revert to the
default. This was a user contribution.

*Andrew contributions include:*
The *About* in the Settings→Preferences now shows the Copyright to include
the Cinelerra-GG team, the previous Cinelerra-CV team, as well as the libav
version. This is also shown in the startup window if using that.
*Debian 12* required a single change to bld_prepare.sh to remove python2
requirement. In addition, debian-testing and ubuntu-testing have now been
switched to the default of debian and ubuntu with their older operating
systems now being named as debian-older and ubuntu-older.
*Modifications* in the thirdparty Makefile and fileexr, filepng, filetga,
filetiff to ensure that builds continue to work in various distros, like
Arch and Slackware.
*Patches *to accommodate ffmpeg 6.0 and 4.4 for certain distros.
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