Fix short_name_size when getNameAsString does not return a prefix (Ma…

…skRay#784)

Resolve "directory" in compile_commands.json in case CWD is not the p…

…roject root

Also delete an unneeded chdir hack.

Close MaskRay#703

Adapt llvmorg-12-init-5498-g257b29715bb: add an argument to the ctor …

…of clang::driver::Driver

Add missing headers to adapt llvmorg-11-init-5501-g213aea4c583 and ll…

…vmorg-11-init-5528-gd7c5037e6b9

indexer: disable warnings and skip processed function bodies

Adapt clang rC370337: removal of createIndexingAction and WrappingIndexAction

Adapt clang rC357037: removal of setVirtualFileSystem

textDocument/didOpen: index related files when a header is opened

Fix MaskRay#180

index.initialBlacklist: ["."] can inhibit initial indexing (useful for larger code bases).
Opened files are still indexed, though.
This heuristic allows related files (a/foo.c a/b/foo.cc) to be indexed when a header (foo.h) is opened.

Add Apache LICENSE file (MaskRay#121)

Implement textDocument/documentLink

Fix hierarchical document symbol

1. Fixed a bug on building document symbol tree: As sym2ds was updated in
place, nested funcs/types may be moved into children of another
lsDocumentSymbol before itself got processed.

2. Namespaces only have declarations, in the old implementation it wasn't included in the result, making the result less hierarchical. This
commit fixes this by including the declarations of a symbol if no
definitions found.