[Config] No flag for Clang standard library, but choice for user
[Config] Silenced Clang compiler warnings
Squashed 'extlibs/aurora/' changes from 0f7013b..aa43ae8

aa43ae8 [Config] Cascaded compiler detection macros
676f09b [Config] Added error message for unsupported clang versions
09117f8 [SmartPtr] Moved makeCopied() into CopiedPtr.hpp, no more separate header
67c3cde [All] Updated module headers
dfd003d [Dispatch] Improved documentation
7b774a8 [Dispatch] Added aurora::NoOp functor
a0df365 [Dispatch] Implemented fallback functions
58e3c8a [Dispatch] Improved documentation
a66109a [Range] Accounted for empty sub-ranges
a3c92e8 [Range] Redesigned and refactored whole Range module
91ef38f [Config] Updated Doxyfile
65c3007 [Meta] Added tupleFront() and tupleBack()
71ba84e [Meta] Added Meta/Tuple.hpp for tuple metaprogramming
50a87a8 [Meta] Added AURORA_AUTO_RETURN macro

git-subtree-dir: extlibs/aurora
git-subtree-split: aa43ae84efc81b08094429593b8c2516232180cf
[Extlibs] Merged Aurora