Jay - inner wall bushes complete
Merge commit '805f076000ddba07114c15b9c18367308fd7c178'
CJ - Adding background image assets. Top + bottom fences, + grass and soil patches
No more drawing outer walls
Rewrite of BG image. No longer using entity class based images and animations. Repeat X and Y, and draw.
Added into main.lua.. as clean as possible.
Added the bottom fence, modified the bottom image