流程退回可选审批人

流程图显示更多流程信息（节点审批人/当前审批节点）
流程配置过滤不存在的元素的配置
支持子流程多实例的审批（传参isEnd）

src/model/workflow/bpmnConfig.ts

@@ -51,7 +51,9 @@ export interface FormInfoItem {
 }
 export interface FlowInfo {
     currentTaskAssigneeNames: string;
-  isCountersign: boolean;
+    currentTaskAssignees:{};
+    taskInfo:{};
+    isCountersign: boolean;
   isAddOrSubSign: boolean;
   schemaInfo: {
     category: string;
@@ -98,7 +100,9 @@ export interface TaskApproveOpinion {
 }
 export interface BpmnFlowForm {
   // schemaId: string;
-    currentTaskAssignee: string;
+    currentTaskAssigneeNames:string;
+    currentTaskAssignees: any;
+    currentTaskInfo:any;
   item: BpmnFlowFormItem;
   xml: string;
   formInfos: Array<FormInfoItem>;