QOL update #1

Hey hello everyone! Today we have a new update, this one is more on the Quality Of Life side of features and fixes!
With stuff like a node speed setting and a tutorial!

Changelog:

• Made nodes change color depending on how many nodes are stacked
• Added nodespeed option to make the game easier or harder depending on what the player wants
• Added a simple tutorial
• Moved the adventure world remix to the medium difficulty
• Added 2 songs: 
  • The Entry town theme from akians
  • The keynode theme
• Changed the songlist layout a bit, with added colors to display difficulty

Quickfix:

• added node timer to the upcoming nodes
• made combo's add to the final score
• fixed music not stopping when exing a level
• fixed some minor bugs
• adjusted node timer visual

if you encounter any bugs, or have suggestions do let me know!