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/scratchpad/scratchpad-commands.js

@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const l10n = require("gcli/l10n");
+
+exports.items = [{
+  item: "command",
+  runAt: "client",
+  name: "scratchpad",
+  buttonId: "command-button-scratchpad",
+  buttonClass: "command-button command-button-invertable",
+  tooltipText: l10n.lookup("scratchpadOpenTooltip"),
+  hidden: true,
+  exec: function(args, context) {
+    let Scratchpad = context.environment.chromeWindow.Scratchpad;
+    Scratchpad.ScratchpadManager.openScratchpad();
+  }
+}];