Update#1 Last elements implementation

Hi !

I took the time to implement the last elements I wanted to add to Space Meow ! The new build of Space Meow includes :

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MISC

- Sprites for the dropdown menu allowing the player to chose between Windowed or Fullscreen.

- An Endless and a Story mode.

- Difficulty scaling in Endless mode.

- A timer.

- Sprites for the sound sliders.

BOSS

- Added a boss in Story mode that spawn when the player reaches 200 points.

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I hope you'll enjoy this new version of Space Meow !

~ Marion.