New: Use ASP.NET Core instead of Nancy

(cherry picked from commit 58ddbcd77e17ef95ecfad4b746084ee9326116f3)

frontend/src/Store/Actions/commandActions.js

@@ -139,7 +139,8 @@ export function executeCommandHelper( payload, dispatch) {
   const promise = createAjaxRequest({
     url: '/command',
     method: 'POST',
-    data: JSON.stringify(payload)
+    data: JSON.stringify(payload),
+    dataType: 'json'
   }).request;
 
   return promise.then((data) => {

frontend/src/Store/Actions/tagActions.js

@@ -53,7 +53,8 @@ export const actionHandlers = handleThunks({
     const promise = createAjaxRequest({
       url: '/tag',
       method: 'POST',
-      data: JSON.stringify(payload.tag)
+      data: JSON.stringify(payload.tag),
+      dataType: 'json'
     }).request;
 
     promise.done((data) => {