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.
Order of variables in MGC.
Debug GUI turned off
Fix bug in Pexeso games - Resources loading in stand-alone build
Merge branch 'develop' of https://github.com/BrainProject/UnityTemp into develop
Fixed untriggered transparency in Main scene.
Fixed border transparency on character in Main scene.
Fixed clipping in Main scene.
Fixed showing of help when minigame is quit.
Added rest of brain parts to enumeration and implemented in Main and Selection scenes.
Merge branch 'feature/HanoiTowers' into develop
Merge branch 'develop' of https://github.com/BrainProject/UnityTemp into develop
Adjust transparency and background color in Main scene
Merge branch 'develop' of https://github.com/BrainProject/UnityTemp into develop
New brain model.
Merge branch 'develop' of https://github.com/BrainProject/UnityTemp into develop

Conflicts:
	Assets/Scenes/Main.unity
Fix main scene - committed with conflicts
Transparency issues solved in Selection scene.
Add minigame FindIt.
Update minigame Puzzle.
Add new branch model in Selection scene.
Minor bug fixes.
Update minor visual details in mini-games scenes
Add minigame Coloring.
Show debugging buttons.
Update Pexeso (and its variants) mini-games
Fix minor bugs.
Update of Pexeso mini-game - game tiles lighting, textures