[URBNG-207] [Android] 3rd version: Implement mock-up communication with web server

I fetched the latest commit from main repo and made following changes to my task:
- WebServerHelper methods are static now
- WebServerHelper uses now UrbanGame class which was in main repo
- I changed names of WebServeHelper class methods accordingly
- AsyncSendWebQuery uses constructor overloading
- unit test checks not only gid, but also other fields of UrbanGame class
- used formatter to format code