v1.01 - Multiple Platforms, Minor QoL Changes — Plastris Steam update #1227127

Dear Players, In this tiny update I implemented a few "quality of life" features, suggested by our wonderful community: - Pause button (Also "Escape" and "P" shortcuts) will now take you to the level selection screen instead of the main menu. (Suggested by Dohi64). - Left / Right arrows on your keyboard can now be used to load previous and next level accordingly. (Suggested by Dohi64). - Sound / music settings will be applied immediately upon changing their values. (Suggested by multiple people). - Sound effects should no longer interrupt each other in certain occasions. - In addition to Windows, Plastris should now work on Mac OS X and Linux. I say "should", because I have nothing to test these versions on, so if something goes wrong don't hesitate to let me know in this forum topic. If you'd like to contribute to the game by sharing your suggestions with me, please leave them on the "D...