simple #include support for shaders
Squashed 'vendor/smaa/' content from commit 71c806a

git-subtree-dir: vendor/smaa
git-subtree-split: 71c806a838bdd7d517df19192a20f0c61b3ca29d
Merge commit 'ffaf68c3bdb1a001e9e2eb818b90532040773200' as 'vendor/smaa'
forgo my custom antialiasing, integrating SMAA, still looking bad for
some reason =="
smaa changes