Make all api fields snake_case (#105)

Change all snake/camelCase mix and match to camelCase everywhere

Fix conversion to not interfer with service interceptors

Add dynamic conversion between camelCase and snake_case to services

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/105

src/services/userList.js

@@ -6,10 +6,10 @@ import {formatISO} from 'date-fns'
 export default class UserListService extends AbstractService {
 	constructor() {
 		super({
-			create: '/lists/{listID}/users',
-			getAll: '/lists/{listID}/users',
-			update: '/lists/{listID}/users/{userID}',
-			delete: '/lists/{listID}/users/{userID}',
+			create: '/lists/{listId}/users',
+			getAll: '/lists/{listId}/users',
+			update: '/lists/{listId}/users/{userId}',
+			delete: '/lists/{listId}/users/{userId}',
 		})
 	}