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• Switched to Clang's native #include completion if clang >= 8. include_completion.cc is kept for clang<8

• Refactored message handlers, deleted related static constructors and removed many ls prefixes from class/struct names.

• textDocument/references and workspace/symbol get a new parameter vector<string> folders; to return results confined in specified folders.

• hierarchical textDocument/documentSymbol lists member functions without definitions.

• Fixed EnumConstantDecl's kind & EnumDecl's vars. $ccls/member on scoped enumerations lists its enumeration constants.

• Fixed/worked around some preamble bugs

• Fixed MSVC 2017 compatibility issues

• tobik added a FreeBSD port

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