Merge Expo and Zoom into a single tool

[Noot-heen]

Go to applets menu and activate both zoom and expo, or use ctrl + alt + up/down. You will notice once using them that they are sort of redundant in utility, with just different UX and UI.
Zoom can:

• show you all windows on a virtual desktop
• let you click which one to bring on top (highlighted in green in this screenshot due to my theme)
• close windows (red X button in the corner of a window)

Expo can:

• show you all windows on all virtual desktops (hover your mouse over the chosen virt deskop)
• let you choose which one to bring on top (click, it's not visually emphasized but that behavior is very present)
• close whichever window (drag and drop to the trash can)
• show you all virtual desktops
• add new virtual desktops

As you can see, they just vary in their looks and 2 additional functionalities in Expo. They should be merged into a tool that replicates GNOME's Activities Overview, such that:

• a horizontal strip has all the existing Virtual Desktops (10% of the screen maybe), a big screen that works just like Zoom (90% of the screen), drag and drop a window to another virtual desktop in the strip,
• the virtual desktops should be capped at 10 and the 1 through 0 keys above qwerty/azerty/... can be used to access them,
• kinda like how this guy did on KDE.
• each virtual desktop have a 3 delete buttons:
  • one that deletes the Desktop and migrates all its windows to the adjacent least cluttered Destktop,
  • one that deletes the Desktop and all the windows in it,
  • one that kills all the windows in that Desktop,
  • ideally they are grouped like your usual window decoration buttons (minimize, maximize, and kill).

And we can say what we all think about how GNOME manages their code, but we cannot deny that a good UI/UX is good and that a redundancy in functionality is by definition kinda pointless.
Also, I am vaguely aware that this change may break some installation/setup, such as ctrl + alt + up/down, hot corners options, or some scripts that rely on expo/zoom being separate tools, and I think this discussion is exactly the place to exchange ideas how to fix that. I already have my ideas but I will abstain from making this post longer than it needs.

[Noot-heen]

It appears a new feature request could be added to this Expo/Zoom rework : https://github.com/orgs/linuxmint/discussions/495#discussion-6823357