Implement typeof expressions #849
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This PR implements
typeofby emulating what JS/TS would do (see also). As such, it's not particularly accurate, for exampletypeof null == "object"even though AS would compile a lonenullwithout class context asusizetypeof SomeClassEnumOrNamespace == "object"even though that's not actually a runtime object in AStypeof doesntEvenExist == "undefined"even though that's not a type in AS (ofc also true forobject)"number"plus
typeof someAnyref == "anyref"since MDN says "Host object (provided by the JS environment) - Implementation-dependent." Not sure if that applies here, though.