Remove some of the more obscure/obsolete OS icons from the list of icons?

Please remove at least some of the OS icons? Many of them are *very* uncommon.

**Note: you can always **_use a custom icon_** if an OS icon is not included by default.**

Here are some of my initial suggestions for potential candidates for removal (the whole list of all current OS icons is here: https://github.com/utmapp/UTM/tree/main/Icons)

- AIX.png
- amigaos.png
- backtrack.png
- bada.png
- beos.png
- cyanogenmod.png
- firefox-os.png
- kaios.png
- maemo.png
- mandriva.png
- meego.png
- os2.png
- palmos.png
- remix-os.png
- sabayon.png
- sailfish-os.png
- syllable.png
- symbian.png
- tizen.png
- webos.png
- yunos.png

PS. Once again, you can always **_use a custom icon_** if your OS icon is not included by default.