Removing source, headers, and vertex shaders for Blur, BloomExtraction, and BloomCombine

[git-p4: depot-paths = "//Dynamic_Static_Engine/Dynamic_Static_Engine_main/": change = 82]
Moving Bloom pixel shaders into the same directory

[git-p4: depot-paths = "//Dynamic_Static_Engine/Dynamic_Static_Engine_main/": change = 83]