Pexeso, Silhouette, Similarity minigame changes

1) Removed excessing tiles in Resource pack menu.
2) Music and sound fixed.
3) Pictures load method changed.
4) Pexeso, Silhouette and similarity merged to one minigame. You can set the minigame by altering currentGame attribute in ResroucePack script in start method (changing the value in attribute definition or Unity inspector has no effect, Unity always reverts in to Pexeso).
5) Some debug logs added.