Now saves and restores your current map.

Signed-off-by: Peter Atashian <retep998@gmail.com>
Tweaked view scrolling boundaries to pixel perfection.
Background y-positioning needs fixing now.

Signed-off-by: Peter Atashian <retep998@gmail.com>
Fixed background positioning.

Signed-off-by: Peter Atashian <retep998@gmail.com>