Add EXRExporter2

src/assetmanager/export/EXRExporter2.ts

+import {WebGLRenderTarget} from 'three'
+import {EXRExporter, EXRExporterParseOptions} from 'three/examples/jsm/exporters/EXRExporter.js'
+import {IExportParser} from '../IExporter'
+import {IRenderTarget} from '../../rendering'
+
+export class EXRExporter2 extends EXRExporter implements IExportParser {
+    async parseAsync(obj: IRenderTarget, options: EXRExporterParseOptions): Promise<Blob> {
+        if (!obj.renderManager) throw new Error('No renderManager on renderTarget')
+        if (obj.isWebGLMultipleRenderTargets) throw new Error('WebGLMultipleRenderTargets not supported')
+        const res = this.parse(obj.renderManager.webglRenderer, obj as any as WebGLRenderTarget, options)
+        return new Blob([res], {type: 'image/x-exr'})
+    }
+}

src/assetmanager/export/index.ts

 export {GLTFWriter2} from './GLTFWriter2'
 export {SimpleJSONExporter} from './SimpleJSONExporter'
 export {SimpleTextExporter} from './SimpleTextExporter'
+export {EXRExporter2} from './EXRExporter2'