AOP-18 | UI join an online game

[KlnSdr]

• design and implement the ui to join an online game
• ask the user for a nickname and the url/ip of the remote server
• make sure both were given before proceeding to the next screen
• only add a rough placeholder for joining the actual online game
• place the class representing this screen in Sinking.UI.views

  review

• [x] requirements per ticket definition are met or a reason was stated if they were only partially met
• [x] code style was adhered to
• [x] feature branche is rebased

[anna5101]

The input verification only checks if the url is a valid url, this needs to be updated for checking if it is a valid url or ip address.

[KlnSdr]

• the verification of the url already accepts ip addresses so no extra ticket is needed
• please trim the white spaces of the username before checking or submitting it. line 63 should look like this

  String nickname = nicknameField.getText().trim();

• the ui should pass the url and nickname to the joinOnlineGame function
• there is no need to comment out the call to joinOnlineGame

[anna5101]

I edited the code so please take a look if its okay now.

[KlnSdr]

implemented all review comments. rebase needed