Rename 'CIndex' to 'libclang', since it has basically become our stable public
(C) API, and will likely grow further in this direction in the future.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@102779 91177308-0d34-0410-b5e6-96231b3b80d8
21 files changed