interface and instance array support

- support for interface instance arrays
- support for interface-using module instance arrays
- support for modport array bindings
- fix modport bindings shadowed in nested instances

test/basic/interface_array_single.v

@@ -0,0 +1,25 @@
+module top;
+    genvar i;
+    generate
+
+        initial #1;
+
+        `define PRINT(X, offset) \
+        for (i = 4; i <= 8; i = i + 1) \
+            initial begin \
+                $display(`"Module``X got %0d`", i ** 2 + offset); \
+                $display("ModuleN got %0d", i ** 2 + offset); \
+            end
+
+        `PRINT(A, 0)
+        `PRINT(A, 1)
+        `PRINT(A, 2)
+
+        `PRINT(B, 1)
+        `PRINT(B, 1)
+
+        `PRINT(C, 2)
+        `PRINT(C, 2)
+
+    endgenerate
+endmodule