Add angular speed gradient for inspector (particle)

inspector/src/components/actionTabs/tabs/propertyGrids/particleSystems/particleSystemPropertyGridComponent.tsx

@@ -318,6 +318,12 @@ export class ParticleSystemPropertyGridComponent extends React.Component<IPartic
                     <FloatLineComponent lockObject={this.props.lockObject} label="Max angular speed" target={system} propertyName="maxAngularSpeed" onPropertyChangedObservable={this.props.onPropertyChangedObservable} />
                     <FloatLineComponent lockObject={this.props.lockObject} label="Min initial rotation" target={system} propertyName="minInitialRotation" onPropertyChangedObservable={this.props.onPropertyChangedObservable} />
                     <FloatLineComponent lockObject={this.props.lockObject} label="Max initial rotation" target={system} propertyName="maxInitialRotation" onPropertyChangedObservable={this.props.onPropertyChangedObservable} />
+                    <FactorGradientGridComponent globalState={this.props.globalState} gradients={system.getAngularSpeedGradients()!} 
+                        label="Angular speed gradients"
+                        onCreateRequired={() => {
+                            system.addAngularSpeedGradient(0, 0.1, 0.1);
+                        }}
+                        lockObject={this.props.lockObject} onPropertyChangedObservable={this.props.onPropertyChangedObservable}/>                    
                 </LineContainerComponent>  
             </div>
         );