Merge branch 'master' of https://github.com/LinneaAndersson/SecondHand

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Now the FadingNotifierText is detached from the scene once it's done
showing the text.
Added a random powerup texture.
It is now logged when powerups are applied .
Started working on implementing a random powerup.
particle sprite
more work on surface particle emitter
Added textures for the "double score" and "reflect" powerups.
Merge branch 'master' of https://github.com/LinneaAndersson/SecondHand

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Implemented the DoubleScore powerup.
Unbroke the power up factory.
Cleaned up powerup code some.
Merge branch 'master' of https://github.com/LinneaAndersson/SecondHand

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Implemented support for mirrored movement in Player.
Implemented the mirrored movement powerup.
Cleaned up some GamePlayScene.
Fixed PMD-warning.
Cleaned up some in GameOverScene.
Made a HighScoreList singelton class for managing the High score list.
This class is now made use of in HighScoreScene, much simplifying the code.
Made use the new class HighScoreList in GameOverScene, much
simplifying the code.