Expose more features through Wayland or other Linux-standard ways

I am willing to help with this issue! I would only need to be pointed in the right direction, as I know close to nothing about Lomiri's internals :)

I'm currently working on SDL support for Ubuntu Touch as well as a corresponding template for Clickable.

I noticed that many features are not exposed in conventional GNU/Linux ways, including:

• High DPI scaling
• Clipboard
• Dark theme
• Cameras
• ...

Most of these are done through Qt-specific mechanisms; the scaling is done through GRID_SIZE_PX, the dark theme is done through a Lomiri theme, etc. This makes it more difficult to support features on Ubuntu Touch, since it does not use the same mechanisms as other systems.

Would it be possible and reasonable to make these features available to non-Qt apps?