Fix strength listed as level for toJson of unsharpMask, vignette, oilPaint (#499)

Author: Nir Maoz

__TESTS__/unit/toJson/adjust.toJson.test.ts

@@ -20,7 +20,7 @@ describe('Adjust toJson()', () => {
     expect(transformation.toJson()).toStrictEqual( [
       {
         actionType: 'unsharpMask',
-        level: 10
+        strength: 10
       }
     ]);
   });

__TESTS__/unit/toJson/effect.toJson.test.ts

@@ -101,7 +101,7 @@ describe('Effect toJson()', () => {
     expect(transformation.toJson()).toStrictEqual( [
       {
         actionType: 'oilPaint',
-        level: 8,
+        strength: 8,
       }
     ]);
   });
@@ -192,7 +192,7 @@ describe('Effect toJson()', () => {
     expect(transformation.toJson()).toStrictEqual( [
       {
         actionType: 'vignette',
-        level: 5,
+        strength: 5,
       }
     ]);
   });

src/actions/effect/EffectActions/EffectActionWithStrength.ts

@@ -7,6 +7,8 @@ import {LeveledEffectAction} from "./LeveledEffectAction.js";
  * @see Visit {@link Actions.Effect|Effect} for an example
  */
 class EffectActionWithStrength extends LeveledEffectAction {
+  LEVEL_NAME = 'strength';
+
   strength(value: number | string): this {
     return this.setLevel(value);
   }

src/actions/effect/EffectActions/LeveledEffectAction.ts

@@ -2,14 +2,14 @@ import {SimpleEffectAction} from "./SimpleEffectAction.js";
 import {ExpressionQualifier} from "../../../qualifiers/expression/ExpressionQualifier.js";
 import {IColorizeModel, IEffectActionWithLevelModel} from "../../../internal/models/IEffectActionModel.js";
 import {EFFECT_MODE_TO_ACTION_TYPE_MAP} from "../../../internal/internalConstants.js";
-
 /**
  * @description A base class for effects with a level, the extending class needs to implement a method that calls setLevel()
  * @extends {Actions.Effect.SimpleEffectAction}
  * @memberOf Actions.Effect
  * @see Visit {@link Actions.Effect|Effect} for an example
  */
 class LeveledEffectAction extends SimpleEffectAction {
+  protected LEVEL_NAME = 'level';
   protected _actionModel: IEffectActionWithLevelModel | IColorizeModel = {};
   protected effectType: string;
   constructor(effectType?: string, level?: number|string) {
@@ -18,7 +18,7 @@ class LeveledEffectAction extends SimpleEffectAction {
     this._actionModel.actionType = EFFECT_MODE_TO_ACTION_TYPE_MAP[effectType] || effectType;
 
     if(level){
-      this._actionModel.level = level as number;
+      this.setLevel(level);
     }
   }
 
@@ -29,7 +29,7 @@ class LeveledEffectAction extends SimpleEffectAction {
    * @protected
    */
   protected setLevel(level: string | number | ExpressionQualifier): this {
-    this._actionModel.level = level as number;
+    this._actionModel[this.LEVEL_NAME] = level as number;
     const qualifierEffect = this.createEffectQualifier(this.effectType, level);
     this.addQualifier(qualifierEffect);
     return this;