* Added Line examples
* Fixed core materials bug
* Added web video worked on platform video texture
* Fixed some things in three_cad

Svg fixes

* Added parametric geometries
* Fixed flutter texture bug

Fixed decals.
Modified gltf and glb importer.
Modified three_viewer for multiviews

* Added angle input to fix flutter multiview issue on web.
* Fixed: PeripheralType.wheel triggered when dragging with 1 pointer

…lling it would not remove the previous pointer due to missing onPointerCancel callback

Added pointers count to the click, drag and scale events to be able to better integrate custom actions to these gestures (such as using the pointer move event to only rotate a model in the scene and not the entire scene)

…nd out using OrbitControls on the Web.

Fixed some issues regarding pointers on Android and Web

…uild() widget visible'

Fix for issue 68

* Fixed: Windows move and change size bug.
* Added: Web track pad scale, rotate, and pan support.
* Changed android minSdkVersion to 21.

Added wasm support for three_js_text.
Fixed bug in three_js_advanced_loaders.

Fixed lensflare for wasm.
Fixed audio.
Fixed postprocessing for web and wasm.
Added webxr examples
Added tonemapping exmple.

protect windowResize from disposed tree

- moved xr examples to an outside folder
- added example for xr for pub dev
- fixed wasm support not showing on pub dev