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/dfa.nim

@@ -591,6 +591,8 @@ proc genUse(c: var Con; orig: PNode) =
     of PathKinds1:
       n = n[1]
     else: break
+    if n.kind in nkCallKinds:
+      gen(c, n)
   if n.kind == nkSym and n.sym.kind in InterestingSyms:
     c.code.add Instr(n: orig, kind: use)