Add configuration option to show Guake on the system taskbar

[ferenczy]

I would greatly appreciate having a configuration option to enable the showing of the Guake window on the system taskbar added, which, when enabled, should also cause it to appear on the Alt+Tab list.

Motivation

I often need to switch between Guake and some other window back and forth repeatedly without Guake losing the focus so I can still see its contents. Currently, to switch back from Guake to the previously focused window without having to use the mouse, I have to press Alt+Tab, keep Alt pressed, and press Alt+Shift+Tab to move the focus where I need, which is super annoying.

It's the same issue as described in the issue #2181. I just propose a different solution.

Note

The Feature request issue template suggests using a website called FeatHub (https://feathub.com/Guake/guake) for reporting feature requests, but its contents look highly suspicious, so it should be probably reviewed and possibly removed.

[novaTopFlex]

On my version of Guake (unsure which version exactly), I do have an icon on the systray, but my more recent issue revolves around the icon disappearing and being replaced with a warning icon. However, the general purpose other than the icon remains in my setup.

[novaTopFlex]

Note

The Feature request issue template suggests using a website called FeatHub (https://feathub.com/Guake/guake) for reporting feature requests, but its contents look highly suspicious, so it should be probably reviewed and possibly removed.

Yes, the website now has Indonesian contents that are totally unrelated to Guake or to the supposed "FeatHub" platform.