Fixed exceptions

Fixed the Unity Editor Null-Reference-Exception and added a check to
ensure the avalibility of the Highscore Element
Fixed a bug and gamelogic

Scores where submitted bevore the check if a name is set
Fuck Newtonsoft

included a miniJSON script and using it instead of the Newtonsoft.Json
DLL
Deleted DLL
Deleted old unused code
small improvements to the controls
Added new Obstacle Texture

new obs texture + fiddling around with normal maps. didnt work though so
changes were reverted
New Coin Animation

Added an animation when a coin is picked up. still some cleanup to be
done, but it works perfectly as far as I can tell
small bugfixes for coin anim stuff
Merge remote-tracking branch 'origin/master' into GraphicsAndGameplay

Conflicts:
	Assets/M_Scripts/Game_Over.cs
	Assets/Scripts/PlatformerCharacter2D.cs
	Assets/main.unity