Ensure OpenXR classes are declared properly

[AThousandShips]

• Fixes: Object is many times heavier than Node or RefCounted...? #81014
• Fixes: Custom objects are slower to instantiate in Godot 4.0 GDScript compared to Godot 3.5.1 #73936
• Fixes: Object allocation is slower since 4.0.beta9 #70853

[akien-mga]

Copying my question from the other PR:

@BastiaanOlij Since we're exposing this class properly now, it's worth thinking about the name. We use "metadata" as a single word throughout the Godot API, and this one is the only one using "meta data" (MetaData in the class name).

Is this a name derived from the OpenXR API, or something we chose ourselves? If the latter, it could be worth standardizing on Metadata / "metadata".

[BastiaanOlij]

@BastiaanOlij Since we're exposing this class properly now, it's worth thinking about the name. We use "metadata" as a single word throughout the Godot API, and this one is the only one using "meta data" (MetaData in the class name).

@akien-mga nope, thats just me not knowing we wrote that as one word :) I'm more than happy with that change.

[BastiaanOlij]

lgtm, just akiens requested change to make meta data -> metadata

[AThousandShips]

Done! Renamed the file in question, to match the spelling

[akien-mga]

There's a use of "meta data" in the doc file, which would be worth changing too. Actually, there's a few more, most in OpenXR code, which we could change:

doc/classes/OpenXRInteractionProfileMetadata.xml:		This class allows OpenXR core and extensions to register meta data relating to supported interaction devices such as controllers, trackers, haptic devices, etc. It is primarily used by the action map editor and to sanitize any action map by removing extension-dependent entries when applicable.
modules/openxr/doc_classes/OpenXRInteractionProfile.xml:		This object stores suggested bindings for an interaction profile. Interaction profiles define the meta data for a tracked XR device such as an XR controller.
modules/openxr/openxr_api.cpp:	// If the io_path is not part of our meta data we've likely got a misspelled name or a bad action map, report
servers/xr/xr_interface.h:	enum Capabilities { /* purely meta data, provides some info about what this interface supports */
tests/scene/test_arraymesh.h:TEST_CASE("[SceneTree][ArrayMesh] Surface meta data tests.") {

(the .po file shouldn't be changed)

And finally, I also noticed that the doc file is in the wrong folder. It should be moved to the module's doc_classes (and for this to work, it should be listed in modules/openxr/config.py).

Edit: Actually, those three should move:

OpenXRAPIExtension.xml                OpenXRExtensionWrapperExtension.xml   OpenXRInteractionProfileMetadata.xml

scope_creep++

[AThousandShips]

Got it!

[AThousandShips]

I believe that's all now

[akien-mga]

Thanks!

[AThousandShips]

Thank you!

[YuriSizov]

Cherry-picked for 4.1.2.