Add readonly and disabled to offer and wishlist pages so user only allowed to change in certain state

Handled Offer and Wishlist item update and deletion change related to match table and waiting table.

MatchedWishlistRecordModel added a new result field to make sure both offer and wishlist have its own result fields.

Add modify time to offer and wishlist table, added StateCityLookupModel and Repository. added StateCodeEnum in utility package

now server can create login cookie and client can store cookie in broser. We use userId as token for login cookie for convinence for now.

2. server return session token with Usermodel after successfully login -> store login status in vuex
3. add log out button -> clear token in localstorage and login status in vuex
4. now we can define each route whether it needs auth (login status) to continue redirecting

Add ExampleRepository.java and ExampleService.java to show how to make Spring service to interact with DB.

Added ServerHttpService.js, Constants.js, ExampleService.js, and changed HelloWorld.vue for show examples.
The front to back end connection is ready.

Change spring boot port to 8081, so it will not interoperate with Vue

"Added example controller and model. Fixed can not start app by comment the DB library, I will uncomment them when I need."