Add error IDs to console output

test/cmdlineTests/error_codes/args

@@ -0,0 +1 @@
+--error-codes

test/cmdlineTests/error_codes/err

@@ -0,0 +1,26 @@
+Error (4937): No visibility specified. Did you intend to add "public"?
+ --> error_codes/input.sol:4:5:
+  |
+4 |     function f() {
+  |     ^ (Relevant source part starts here and spans across multiple lines).
+
+Warning (3420): Source file does not specify required compiler version!
+--> error_codes/input.sol
+
+Error (4247): Expression has to be an lvalue.
+ --> error_codes/input.sol:5:9:
+  |
+5 |         2=0;
+  |         ^
+
+Error (7407): Type int_const 0 is not implicitly convertible to expected type int_const 2.
+ --> error_codes/input.sol:5:11:
+  |
+5 |         2=0;
+  |           ^
+
+Error (2614): Indexed expression has to be a type, mapping or array (is literal_string "")
+ --> error_codes/input.sol:6:9:
+  |
+6 |         ""[2];
+  |         ^^

test/cmdlineTests/error_codes/exit

@@ -0,0 +1 @@
+1

test/cmdlineTests/error_codes/input.sol

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-3.0
+
+contract C {
+    function f() {
+        2=0;
+        ""[2];
+    }
+}