Merge pull request #11956 from ethereum/userDefinedTypesContractAccess

Allow accessing user defined value type members via contract name.

test/libsolidity/syntaxTests/userDefinedValueType/wrap_unwrap_via_contract_name.sol

@@ -0,0 +1,9 @@
+contract C { type T is uint; }
+library L { type T is uint; }
+interface I { type T is uint; }
+contract D
+{
+    C.T x = C.T.wrap(uint(1));
+    L.T y = L.T.wrap(uint(1));
+    I.T z = I.T.wrap(uint(1));
+}

test/libsolidity/syntaxTests/userDefinedValueType/wrap_unwrap_via_contract_name_different.sol

@@ -0,0 +1,8 @@
+contract C { type T is uint; }
+library L { type T is uint; }
+contract D
+{
+    C.T x = L.T.wrap(uint(1));
+}
+// ----
+// TypeError 7407: (86-103): Type user defined type T is not implicitly convertible to expected type user defined type T.