static member variable informations aren't correctly forwarded to the Language client

[FederAndInk]

Observed behavior

The SymbolKind of static member variable is SymbolKind::Variable and not SymbolKind::Field.

I don't know if it is expected.

The point is that It is then difficult to know on the client if we have a member or not.

I thought about checking if the parentKind was a SymbolKind::Class, but then I saw this information was not forwarded to the client, and received a SymbolKind::Unknown(0). (see MaskRay/vscode-ccls#90)

Expected behavior

Either mark static member variable kind as SymbolKind::Field
or forward the parentKind information (I have tested it if you want to see and tell me if this could work or if there is another cleaner way to do this: FederAndInk@b6491f5)

System information

• ccls version (git describe --tags --long):

ccls version 0.20190823.5-18-g5a08ff99
clang version 9.0.1 

• OS: ArchLinux
• Editor: vscode
• Language client (and version):
  master -> MaskRay/vscode-ccls@c144a58