more performance improvements
performance tweak with early check in is_transparent
sign caching needs work, temporary workaround
refactored main.c so the main function isn't so big
rollback due to bug
fixed bug
minor fix
added RENDER_SIGN_RADIUS
track min and max y value per chunk for use in chunk_visible
minor fix
Merge branch 'master' into app

Conflicts:
	src/main.c