Add Qt annotations

[pterror]

Tested both by adding all .xml interface files to a Qt project via qt_add_dbus_interface, and through meson test -C _build.

Two tests are failing, attached for posterity: testlog.txt They don't seem to be introduced by this PR though, as I can still reproduce them on the previous commit, even after a clean rebuild.

Note that Lockdown.xml still errors as its property names are kebab-cased instead of snake_cased, which Qt considers as invalid.

• Add missing Qt type annotations for complex types
• Reorder Qt type annotations to the line above their corresponding parameters for consistency
• Fix incorrect argument names

Also does minor formatting changes for consistency:

• Prefer double quotes over single quotes
• Prefer type= before name=