David Goldman e5caf44fda Add a BuildSystemDelegate which supports notifications for build settings changes ...

Introduce a `BuildSystemDelegate` to handle notifications from the build system

* `SourceKitServer` is the main delegate to process these notifications
* Currently limited to changes in `FileBuildSettings`
* Delegate informs the `BuildSystem` of files to watch via `registerChangeWatching(for: URL)` and `unregisterChangeWatching(for: URL)`
* In the future we could have more integration for handling changes in dependencies

Handling changes in `FileBuildSettings`

* `SourceKitServer` sends notifications to the internal LSPs informing them of any opened documents that have changes in their compiler flags
    * For clangd, we send a notification to update the compilation database
    * For SourceKit/sourcekitd we must close and reopen the file to force a new AST with the new compiler flags

2019-09-06 17:44:36 -04:00

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