I've change the urls variable to be a local, instead of manually allocating it all the time.
This is only used locally and was causing a memory leak because FreeUPNPUrls gave the impression it free it.
1. FreeUPNPUrls doesn't free the pointer passed in, that's up to caller.
2. The second if(!urls) produced dead code as we checked the pointer just after allocation.
Due to the low resolution of the occlusion buffer, small gaps between occluders can be closed and incorrectly occlude instances which should show through the gaps. To ameliorate this problem, this PR jitters the occlusion buffer over time, making it more likely an instance will be seen through a gap. This is used in conjunction with an occlusion timer per instance, to prevent instances flickering on and off rapidly.
Reimplements "Remove Immutable" by comparing to the skeleton rest.
It is necessary to delay removing animation tracks until after the correct rest pose is calculated in rest-fixer.
Preserves the original implementation in the GLTFDocument / FBXDocument API for compatibility.
WMR isn't supported on non-Windows platforms, so there's no point
in mentioning it in the error message as it's not a possible
cause for OpenXR not initializing.
The Godot.NET.Sdk (for C# use) should define the property `UsingGodotNETSdk` in its [SDK.props](a07dd0d6a5/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props).
## Why
Defining this property allows shared build configuration (e.g. Directory.Build.targets or other imported msbuild files) to detect deterministically when they are operating within the scope of a project controlled by Godot.NET.Sdk. This enables shared build configuration that may span many different projects within a folder to have Godot.NET.Sdk-specific configuration that only applies to Godot projects.
## Why named UsingGodotNETSdk
This naming scheme is common practice in Microsoft Dotnet SDKs. For example, the property `UsingMicrosoftNETSdk` is defined by the default SDK, `UsingMicrosoftTraversalSdk` is defined by [Microsoft.Build.Traversal](363532de5b/src/Traversal/Sdk/Sdk.props (L10)), `UsingMicrosoftNoTargetsSdk` by [Microsoft.Build.NoTargets](363532de5b/src/NoTargets/Sdk/Sdk.props (L10)), and so on. The property `UsingMicrosoftNETSdk` is even used in the implementation of Godot.NET.Sdk for conditional logic of the type predicted here.
Note that these "Using*" properties are _additive_ in the sense that more than one can be defined for a given project (as SDKs can effectively be built upon other SDKs, using them as components). So, it is normal and appropriate for both `UsingMicrosoftNETSdk` and `UsingGodotNETSdk` to be simultaneously defined within the same project.
