V0.19.1 touchscreen accessibility and new particles

IMPROVEMENTS TO ROLLER COASTERS

• added clickable on-screen buttons to allow raising or lowering rails on touchscreen
• added rolling wagon sound
• added Lavamatic smoke particles

VISUAL IMPROVEMENTS

• changed object removing particles
• tweaked guide panel colors and transparency

BUGFIXES

• fixed skybox on mobile
• fixed repairing minigame sometimes not really repairing chosen ride
• fixed object placer being moved when interacting with UI
• fixed player in first person view not colliding with rails on ground level