comment: add clang_TextComment_getText
comment: stubs
cursor: impl clang_CXXMethod_isPureVirtual
cursor: cosmetics
completion: add clang_getCompletionParent + clang_getCompletionBriefComment
result first import
cursor: stub for clang_findReferencesInFile
translationunit: stub for clang_findIncludesInFile
cursor: stub for clang_findReferencesInFileWithBlock
translationunit: stub for clang_findIncludesInFileWithBlock