reNX: Simplify Bitmap loading and remove the need for locks in lazy nodes.

Signed-off-by: angelsl <hidingfromhidden@gmail.com>
reNX: Reformat code.

Signed-off-by: angelsl <hidingfromhidden@gmail.com>
reNX: Improve thread safety.

Signed-off-by: angelsl <hidingfromhidden@gmail.com>