Build 25539756

- Now custom songs import is unlocked by default after the tutorial.
- Brand new tutorial.
- Rebalanced all the Easy songs to be more beginner-friendly.
- Changed the way difficulty rating is calculated, taking into account also gltiched zombeats usage.
- Now charts may have up to 20 stars.
- Now the CHILL difficulty for the story mode also disables glitched zombeats.
- Now rings draw a circle on the ground. In this way they should be more readable.
- The level editor now supports a new tool called "Split heads" specular to the "Merge heads" tool, allowing to split a multi-head zombeat into multiple single heads.
- Now the Merge and Split tools in the level editor let the charter choose the interval (1/8, 1/16 etc.) to merge/split the heads.
- Now the level editor will preview the expected difficulty rating of the level, based on the current settings and events.
- Now the "Optimize Sprites" button in the level editor, also converts all sprites to png format to improve the loading process.
- Made a huge optimization pass on the handling of big sprites in the charted songs from workshop.
- Now text and sprites animations parameters can be typed in the level editor, instead of using only the sliders.
- Now the level editor color pickers will save your last used colors, so that you can easily reuse them.
- In the level editor you can now see the curve of the intensity of a shader, to better read your transitions.
- Fixed some resolution issues with the level editor. Now when there are many lanes, a vertical scrollbar for the timeline will appear, so that you can reach the events that are not visible on the screen.
- Fixed a minor issue with auto-play.
- Now the music-selection menu won't reload each time a workshop level is downloaded. New levels will appear after entering the menu or refreshing the page with the refresh button.
- Now rainbow trails are always visible.
- Fixed minor bugs and crashes.
- Minor changes to some VFX.
- Minor UI Changes.