Updated walls and music
GameScene improvements

Can now be used for multiple levels
Removed log statements
Updated help with images and multiple pages
Made separate door prefab

So doors open/close at one end rather than in the middle
Cleanup of maze/door revamp
Improved AI for player snake returning to start
Improved level 1 layout
Fixed positioning of door sprites
Updated theme1
Options scene - set 7 ticks for sound volumes
Fixes for level transitions within the same scene
Fix for balance
Odds and ends (version update, comment)
After level 1, enemy snakes start at 7 segments
Screenshot is no longer a child of maze