Using llvm::yaml for options IO.
[clang-modernize] Update for API change.

NFC.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@219063 91177308-0d34-0410-b5e6-96231b3b80d8
[clang-tidy] Allow space between "TODO" and "(user)"


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@219091 91177308-0d34-0410-b5e6-96231b3b80d8
Add OptionsView::get(), OptionsView::store() for enumeration type that uses llvm::yaml structures to define mapping.
Merge remote-tracking branch 'remotes/origin/master' into feature/clang-tidy-misc-qualifiers-order