Bug 912121 - Migrate major DevTools directories. rs=devtools

Move major DevTools files to new directories using the following steps:

hg mv browser/devtools devtools/client
hg mv toolkit/devtools/server devtools/server
hg mv toolkit/devtools devtools/shared

No other changes are made.

devtools/client/webconsole/test/test-bug-597136-external-script-errors.js

@@ -0,0 +1,14 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Contributor(s):
+ *  Patrick Walton <pcwalton@mozilla.com>
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+function f() {
+  bogus.g();
+}
+