* Support for clangd's go-to-definition for header files
- By forwarding the request to clangd when it fails to give
symbol information, we are able to use its built in
go-to-definition support for headers (jump to header file)
* Add static tibs test for clangd go-to-#include
* Move #include test to SourceKitTests and regenerate linux main
* Fix improper escaping of %40 in file URLs
* Add URL escaping test
* Another attempt to fix broken BuildServerBuildSystemTests test on Linux
- URL's `standardizedFileURL` removes trailing slashes from file URLs,
but only on Linux
Request types should always have the suffix Request and notifications
should end with Notification.
Also moved all request and notification types into separate folders to
reduce the number of files in the LanguageServerProtocol folder.
According to the LSP specification, arbitrary URIs can be used as
document identifiers. Instead of internally assuming that all URIs are
URLs, use a DocumentURI enum to represent URIs. These can either be file
URLs or other URIs whose value as treated as an opaque string.
`SourceKitServer` now talks to the `SwiftLanguageServer` and
`ClangLanguageServerShim` directly through the `ToolchainLanguageServer`
protocol.
Each individual `ToolchainLanguageServer` manages its own threading.
Change-Id: I77aa5468f1486bd4e6e6fdb732c6a051ee05c6d1
