CMake was previously doing this itself before 4.0, but seems to be
inserting `/usr/bin/*` now. Resolve the `/usr/bin` trampoline ourselves
in a similar fashion to swiftly (but with xcrun).
Resolves rdar://163462990.
The modulo operator associated `0` and `100`, so the computation here was essentially `handle?.numericValue ?? (0 % 100)`, equivalent to `handle?.numericValue ?? 0`, which means that we didn’t acutally perform modulo operations on the numeric value, which means that we would exceed the maximum number of `os_log_t` objects after some time.
rdar://162891887
There is only one real class that implements the `SourceKitD` protocol, so there really isn’t any need for the protocol + class split at all. Unify them to make code simpler to reason about.
We need to jump through a few extra hoops when the SourceKit plugin is located in SourceKit-LSP’s build folder and we are using `sourcekitd_plugin_initialize` instead of `sourcekitd_plugin_initialize_2`.
This adds a sourcekitd plugin that drives the code completion requests. It also includes a `CompletionScoring` module that’s used to rank code completion results based on their contextual match, allowing us to show more relevant code completion results at the top.
