3.3.0

Major updates

Added a ParticleHelper class to create some pre-configured particle systems in a one-liner method style (DevChris)
Added new MixMaterial to the Materials Library allowing to mix up to 8 textures (julien-moreau)
Added new PhotoDome object to display 360 photos. Demo (SzeyinLee)
New GUI 3D controls toolset. Complete doc + demos (Deltakosh)
Added Environment Texture Tools to reduce the size of the usual .DDS file (sebavan)
New GUI control: the Grid (Deltakosh)

All NPM packages have latestand preview streams #3055 (RaananW)
Added New Tools Tab in the inspector (env texture and screenshot tools so far) (sebavan)

Added new Animatable.waitAsync function to use Promises with animations. Demo Here (Deltakosh)
Added the choice of forming a closed loop to the catmull-rom-spline curve3 (johnk)
Added support for specifying the center of rotation to textures (bghgary)
Added webVR support for Oculus Go (TrevorDev)
Added ability to not generate polynomials harmonics upon prefiltered texture creation (sebavan)
Added predicate function to customize the list of mesh included in the computation of bounding vectors in the getHierarchyBoundingVectors method (sebavan)
Added webVR constructor options: disable laser pointer toggle, teleportation floor meshes (TrevorDev)
Get a root mesh from an asset container, load a mesh from a file with a single string url (TrevorDev)
UtilityLayer class to render another scene as a layer on top of an existing scene (TrevorDev)
AnimationGroup has now onAnimationGroupEnd observable (RaananW)
Pointer drag behavior to enable drag and drop with mouse or 6dof controller on a mesh (TrevorDev)
Gizmo and GizmoManager classes used to manipulate meshes in a scene. Position, rotation, scale, and bounding box gizmos (TrevorDev)
Added a new mesh.ignoreNonUniformScaling to turn off non uniform scaling compensation (Deltakosh)
AssetsManager tasks will only run when their state is INIT. It is now possible to remove a task from the assets manager (RaananW)
Sprite isVisible field (TrevorDev)
Added support for minScaleX, minScaleY, maxScaleX, maxScaleY for particles (Deltakosh)

Added support for KHR_texture_transform (bghgary)
Added onNodeLODsLoadedObservable and onMaterialLODsLoadedObservable to MSFT_lod loader extension (bghgary)
Added glTF loader settings to the GLTF tab in the debug layer (bghgary)

No fullscreen button on small devices (RaananW)
Nav-Bar is now displayed on fullscreen per default (RaananW)
Viewer configuration supports deprecated values using the new configurationCompatibility processor (RaananW)
Shadows will only render while models are entering the scene or animating (RaananW)
Support for model drag and drop onto the canvas (RaananW)
New lab feature - global light rotation #4347 (RaananW)
New NPM package - babylonjs-viewer-assets, to separate the binary assets and the code of the viewer (RaananW)

VR experience helper will now fire pointer events even when no mesh is currently hit (TrevorDev)
RawTexture.CreateAlphaTexture no longer fails to create a usable texture (TrevorDev)
SceneSerializer.SerializeMesh now serializes all materials kinds (not only StandardMaterial) (julien-moreau)
WindowsMotionController's trackpad field will be updated prior to it's onTrackpadChangedObservable event (TrevorDev)

Fixed shadowEnabled property on lights. Shadows are not visible anymore when disabled (sebavan)
Physics unregisterOnPhysicsCollide didn't remove callback correctly #4291 (RaananW)
Added missing getter and setter for global exposure in ColorCurves (RaananW)
Fixed an issue with view matrix when ArcRotateCamera was used with collisions (Deltakosh)
Fixed a bug with setting unlit on PBRMaterial after the material is ready (Wrong dirty flags) (bghgary)
Fixed HighlightLayer support on browsers not supporting HalfFloat (sebavan)
Fixed support for R and RG texture formats (sebavan)
Fixed updatable parameter setting in the SPS (jerome)
Angular and linear velocity were using the wrong method to copy values to the physics engine (RaananW)

Fix Navbar Interaction on Mozilla/Firefox (SzeyinLee)
Fix Animation Slider Interaction on Mozilla/Firefox (sebavan)
Fix Animation Slider Clickable area size Cross Plat (sebavan)
Ground material didn't take the default main color is no material definition was provided (RaananW)
Model configuration was not extended correctly if loaded more than one model (RaananW)
It wasn't possible to disable camera behavior(s) using configuration #4348 (RaananW)
Animation blending was always set to true, ignoring configuration #4412 (RaananW)
Animation navbar now updates correctly when a new model is loaded #4441 (RaananW)

Fixing support for R and RG texture formats made us remove TextureFormat_R32F and TextureFormat_RG32F as they were mixing formats and types. Please, use the respective TextureFormat_R and TextureFormat_RG with the Float types (sebavan)