sink parameter inference for types that have destructors (#13544)

* ensure capitalize doesn't take an inferred sink parameter

* sink parameter inference: first version, for now disabled. Changed that sink parameters can be consumed multiple times in order to adhere to our spec.

* sink inference can now be disabled with .nosinks; sometimes for proc type interop this is required

* fixes yet another critical DFA bug

* better implementation that also understands if expressions etc

* document sink parameter inference and allow for global disabling

compiler/condsyms.nim

@@ -111,3 +111,5 @@ proc initDefines*(symbols: StringTableRef) =
     # will report the right thing regardless of whether user adds
     # `-d:nimHasLibFFI` in his user config.
     defineSymbol("nimHasLibFFIEnabled")
+
+  defineSymbol("nimHasSinkInference")