Added changelog page & improved room creation

We are happy to announce that we added a changelog page. On this page you can see every change to the game we ever made. You can also click on versions to display more information about a certain version (note: currently, the version page will display the same information as the overview page). We also improved the room creation process - you can now set a player limit before creating a room and you may apply promotional codes in the upper right corner of the room creation card. You can try it out by applying the code "ZeroSeven" - it is valid until 30.04.2021 and will increase the player limit to 14 players per room (normally without a NextGlobe One subscription, a maximum of 10 players can be selected). Furthermore, we added the possibility to rename oneself in the room overview on request. Renaming now also works by clicking on your username, not only by clicking on the edit (pen) button.