Fixes CMake error

StatusNotifierButton: switch to dbusmenu-lxqt

- Now returns floating point QPointF, should we keep
it instead of rounding and do floating point calculations?

- QEyesPlugin: remove deprecated setMargin() call

TODO: check if syntax is correct and equivalent

Qt::AA_UseHighDpiPixmaps has no effect now

Not sure about this but I get:

error: static assertion failed: Pointer Meta Types must either point to
fully-defined types or be declared with Q_DECLARE_OPAQUE_POINTER(T *)

setNamedColor() is deprecated in Qt6

Code is hacky, find better solution

TODO: Still don't know why prefix does not work

- Remove includes to QDesktopWidget

NOTE: Fix compilation with Xlib.h

Xlib.h is tricky because at line 82 has:

`#define Bool int`

And QtCore/qjsonvalue.h at line 28 has:

```
enum Type {
   ...
   Bool = 0x1,
   ...
}
```

This is fixed temporarily by moving Xlib.h
include to last and undefine Bool macro

Long term we want to hide X11 related code and encapsulate in a backend.
This backend will not expose X11 headers.

Many X11 specific functions got moved away from KWindowSystem header.

Long term we will move everything to a backend.

Use QScreen instead

Reported by Clazy

Reported by Clazy

Teporary objects get destroyed after call ends.
State is not updated.

- Reported by Clazy
- Also fix formatting a bit

- Use Qt::CaseInsensitive instead
- Pass argument by reference
- Format braces

TODO: QX11Info::getTimestamp() was replaced with XCB_CURRENT_TIME macro.

I don't know if this breaks functionality.
Getting real timestamp involves messing with Qt private APIs

- Forward declare classes
- More refactory could be done here

- Use Xcb::ScopedCPointer for POD types

In Qt6 it's an alias

TODO: is behavior equivalent? Conversion flags...

This is an abstract interface to operate windows
and workspaces

- Move WindowProperty enum to lxqttaskbartypes.h

This model will manage the tasks shown

Also use it to get window icon

- Don't rely on global screen coordinates

- This will be needed for future Wayland port,
  Where we don't have global screen coordinates

- Keep compatible behavior on X11

This new window propery flag is needed to notify geometry changes

- It is now a global instance

This will be used to avoid crashing panel in case no backend could be
created.
A warning message will be printed in this case.

- Clarify desktop index range

TODO: this will disable changing desktop names