Add the actual in UserCurriculum

Rework the unregister procedure
Add ChangeCurriculumRequest
Add the changeCurriculumRequest submit

frontend/src/rest/requests.js

@@ -46,4 +46,8 @@ export async function editUnregReq(id, newstate){
 
 export async function getAllPayments(){
     return restGet("/payment")
+}
+
+export async function postChangeCurrReq(item){
+    return restPost("/changecurriculumreq", item)
 }