Made symbol searching plug-able through indexing support.
The indexing support for the built-in code model is moved to its own file. Symbol searching will now call for a searcher through that support interface, which will create a fully configured and ready-to-go searcher that can be started in the/a future. Change-Id: Idc3ee1c7c789a69fa05ee1d42415313dcea94cf8 Reviewed-by: Nikolai Kosjar <firstname.lastname@example.org>
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