Support unpacked array in DPI-C (#2648)

* Add tests for unpacked array in DPI-C

* Add more generic parameter generator to AstNodes

* Supports multi dimensional array in DPI ( DPI argmuments <=> Verilator internal type conversion)

consider typedef in V3Task

fix export test

fix inout for scalar

support export func of time

* V3Premit does not show an error for wide words nor ArraySel

* Unnecessary pack func for unapcked array does not appear anymore

* Support unpacked array in runtime header

- Add an overload for lvalue VL_CVT_PACK_STR_NN
- Allow conversion from void *

* touch up tests for codacy advices

* resolve free functions. no functional change intended.

src/V3Premit.cpp

@@ -127,7 +127,9 @@ private:
                 } else if (VN_IS(nodep->backp(), Sel)
                            && VN_CAST(nodep->backp(), Sel)->widthp() == nodep) {
                     // AstSel::width must remain a constant
-                } else if (nodep->firstAbovep() && VN_IS(nodep->firstAbovep(), ArraySel)) {
+                } else if ((nodep->firstAbovep() && VN_IS(nodep->firstAbovep(), ArraySel))
+                           || ((VN_IS(m_stmtp, CCall) || VN_IS(m_stmtp, CStmt))
+                               && VN_IS(nodep, ArraySel))) {
                     // ArraySel's are pointer refs, ignore
                 } else {
                     UINFO(4, "Cre Temp: " << nodep << endl);