Change visibility of and rearrange some methods
Get duck sensor height only when it is created
Disable blending when drawing backgrounds (fixes
https://github.com/SweatyReptile/loser/issues/2)
Load images in AssetManagerPlus instead of directly (fixes
https://github.com/SweatyReptile/loser/issues/9)
Clean imports
Merge branch 'bugfixes_and_cleanup'