Version 0.2.97 released, leaderboards

This release brings a bunch of smaller graphics and UI modification, as well as the first, preliminary version of the leaderboards. There are some minor issues in both handling and UI in the current leaderboard implementation. Will be bumping up the version to 0.3 once I've done some minor updating.

Current leaderboard features:

• Can change name in the mainmenu
• Player name and highscore is tied to platform/backend by way of randomly generated id that's saved in local data
  • no account and all anonymous data
• Separate leaderboards for All time, Monthly, Weekly, Daily and Hourly
• Leaderboard view can be activated from both the main menu or the game over menu

Plans for leaderboards in the future:

• Drop the Hourly leaderboard, as unneccessary at least for now, maybe even Daily.
• Integrate the leaderboard better to the gameover menu
  • For instance, show leaderboard positions around the player, and indicate when you have gotten an all time/monthly/etc. highscore
• Indicate your own score better once in the leaderboards - by way of color/style of the row where your own score is
• Show how much time remaining until a reset of a leaderboard