+ Removed asserts for (l)gpl & (l)gpl3 making it easier to enable and disable all
(l)gpl & (l)gpl3 portions
+ Fix build inputs so that nonfree software isn't pulled in when building ffmpeg
+ Fix compiler on systems with clang
+ Disable libraries that fail on darwin until they can be fixed
+ Fix linux only build inputs so that they aren't pulled in on other platforms
+ Fix optional build inputs
+ Opencv causes circular dependency issues so it is disabled until it can be resolved
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