Snake tails
Snake segment widths

For now, disabled snake tail but still using variable widths
Egg tweaks

Added enemy egg graphic, and set lain egg rotations to 0
Remove frog earlier in end level sequence
Fixed level 1 maze hints

Added maze hint visual debugging through arrow graphic
Refactored egg manager out of game manager
Fixed setup problem to do with initial sequence in game scene
Improvements to help scene
Changed scale of difficulty to always start at 1.
Added volume multiplier to audio control
Fixed fadein colour