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4f1889c2cb
This is a pretty fundamental refactor of the way CppComprehensionEngine works. Previously, in order to answer queries such as "goto definition" or "autocomplete", we would do ad-hoc logic of walking the AST, collecting available declaration nodes, computing scopes, and so on. This commit introduces an architectural change where each Document builds a hashmap of symbols on creation. With these hashmaps, it's easier to iterate over all of the available symbols, and to answer a query such as "which symbols are defined in this scope".