feat: portals can now belong to a dimension and only work while that dimension is active
feat: mid-air jump tiles can now belong to a dimension too
feat: walls, doors, spikes, cannons, switches, platforms, signs, gems and the golem take the color of the active dimension
feat: new dimension-colored sprites for portals and mid-air jump tiles
feat: chill mode now plays through all levels like normal and expert
feat: finishing the last level in chill returns to the level select
feat: hint to try normal after a fast practice clear, in-game and in the level select
feat: level select shows which buttons switch the difficulty
feat: tutorial now mentions that controls can be changed under options
feat: demo levels 6, 12, 13 and 17 use the new colored portals
fix: removed the color filter over the level when switching dimensions
fix: the golem no longer darkens when it starts to disintegrate
fix: removed the popup after each level in chill mode
fix: unified the outline color of all sprites
chore: removed old and unused sprites