Wayland: Improve compositor compatibility by allowing older globals

[Riteo]

Fixes #90612

Previously we pretty much hardcoded most of the globals we requested, causing compatibility issues with certain compositors like Weston, which support only some pretty old versions or miss some more advanced protocols.

To put fuel on the fire, we also errored out when certain protocols weren't available, despite us being able to boot a game just fine (but obviously with a degraded featureset).

The solution is to simply allow all the way from version 1 to the current latest, adding some compatibility code (such as for older wl_outputs or newer wl_pointers).

While we're at it, this commit also fixes a few typos and naming inconsistencies I found.

Edit: oh right, this also removes some initialization code for an unused global, wl_subcompositor.

Bonus content

Here's a an updated version of the table I put in the above issue ticket:

Object Name	Minimum Version Accepted	Maximum Version Implemented	Mandatory?	Notes
wl_compositor	1	6	y	surface creation
xdg_wm_base	1	6	y	desktop windows
wl_shm	1	1	y	cursor buffer handling
wl_data_device_manager	1	3	n	clipboard and drag&drop
wl_output	1	4	n	screen info, can be registered multiple times
wl_seat	1	9	n	basic input, can be registered multiple times
wp_viewporter	1	1	n	buffer "stretching", fractional scaling dependency
wp_fractional_scale_manager_v1	1	1	n	fractional scaling
zwp_primary_selection_device_manager_v1	1	1	n	primary clipboard
zwp_pointer_constraints_v1	1	1	n	pointer constraints
zwp_relative_pointer_manager_v1	1	1	n	relative pointer input, especially useful when paired with pointer constraints
zwp_pointer_gestures_v1	1	1	n	touchpad gestures
zwp_tablet_manager_v2	1	1	n	drawing tablet support
zxdg_decoration_manager_v1	1	1	n	manual server-side decorations handling (libdecor-less fallback)
zxdg_activation_v1	1	1	n	attention requesting
zwp_idle_inhibit_manager_v1	1	1	n	idle inibition (non-GNOME)
zxdg_exporter_v1	1	1	n	dbus desktop integration

Much better I'd say :D

[akien-mga]

Thanks!