Add new ClangClToolChain, which is autodetect by checking the registry
key created by LLVM and trying to find a suitable version of MSVC2015.

Add ClangClParser for parsing the output.

[ChangeLog][ProjectExplorer] Added experimental support for clang-cl.

Task-number: QTBUG-50804
Task-number: QTCREATORBUG-15641
Change-Id: Id34341570e935afc8ef6a104421d4abb5892176f
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>