Make image name used as menu icon configurable

[sunweaver]

Hi,

I am currently working on a project where I want to use the Yaru theme on a non-Ubuntu distribution in combination with Brisk Menu. The Yaru theme ships the Ubuntu circle-of-friends as start-here-symbolic.svg. This (circle of friends as start menu icon) works nice on Ubuntu systems, but feels misplaced on Debian, openSUSE, etc.

I have been thinking about how to amend this for my system, initially thought that I have to provide some patch to the Yaru theme, but I now found a much easier and more generic approach (that Brisk Menu will benefit from).

I'd like to ask my co-developer on this customer project to provide a patch for Brisk Menu that allows one to customize the icon name used as start menu icon.

I can then provide a MATE start menu icon via another package that resembles the Yaru icon style (and drop it into /usr/share/icons/Yaru/...), tweak Brisk Menu's new icon-name gsettings option via an override and tadaaa... have my own customized icon in Brisk Menu.

Please veto now if you feel this is a bad idea.

Please note, that MATE's classical menubar applet also provides an 'icon-name' gsettings parameter, the idea is to immitate its behaviour and port it over to Brisk Menu.

[sunweaver]

@flexiondotorg highlighting Wimpy on this ^^^