P2: Multiplayer improvements
View: Fix missing sound effect
View: Change pause screen
SongSelect: Add sub-titles
View: Blue gauge for second player
Fix Japanese translation
P2: Add multiplayer session
GameConfig: Fix css assets
add game config
Hide barlines when they should be hidden
SongSelect: Selectable text, assets cleanup, and bug fixes
View: Rewrite
Generate previews for songs
Add debugging user interface