Search declarations by ID in addition to their range
The declaration search based on "findContextAt" completely fails when there are multiple different versions of a header which were parsed differently depending on a macro. Also, findContextAt does a linear search, and may be slow when there is a large list of contexts. Whenever possible, try finding the declaration by its qualified identifier based on the duchain symbol table, which should be more efficient and scalable. Extract the qualified identifier from clang by following up the chain of semantic parents. After declarations were found based on the symbol table, they are filtered the same way as those found by findContextAt -- so there should be no regressions. When the search fails, then use the previous findContextAt method instead. Added a test which tests several difficult cases that failed without this change, and that succeed with it. This also fixes the testDeclarationsInsideMacroExpansion test, which was EXPECT_FAIL, but which succeeds now.
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