Upgrade to TinyMCE 4.5.1

- New flat theme (with padding tightened a bit from the default to fit
  in right-hand pane)
- Adds search/replace within notes
- Adds URL autolinking
- Image pasting/dragging is now properly disallowed (though TinyMCE 4
  has hooks that may allow us to actually support this by automatically
  creating attachments)
- New blockquote style with color bar
- Replaces custom context menu on link click with built-in version

 To-do:

- Fix display of pop-ups, which are now modal dialogs within the note
  frame instead of pop-up windows, to stay fully within the frame
- Localize (more important now that there are tooltips)
- Support image dragging
- Update elements list for HTML5, for better drag-and-drop?
- Move directionality control to context menu instead of taking up
  toolbar space?
- Evaluate other plugins for potential inclusion
- Show additional controls in separate note window?
- Fix opacity of text in tooltips

Closes #451, closes #421

resource/tinymce/plugins/contextmenu/plugin.js

@@ -0,0 +1,116 @@
+/**
+ * plugin.js
+ *
+ * Released under LGPL License.
+ * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
+ *
+ * License: http://www.tinymce.com/license
+ * Contributing: http://www.tinymce.com/contributing
+ */
+
+/*global tinymce:true */
+
+tinymce.PluginManager.add('contextmenu', function(editor) {
+	var menu, visibleState, contextmenuNeverUseNative = editor.settings.contextmenu_never_use_native;
+
+	var isNativeOverrideKeyEvent = function (e) {
+		return e.ctrlKey && !contextmenuNeverUseNative;
+	};
+
+	var isMacWebKit = function () {
+		return tinymce.Env.mac && tinymce.Env.webkit;
+	};
+
+	var isContextMenuVisible = function () {
+		return visibleState === true;
+	};
+
+	/**
+	 * This takes care of a os x native issue where it expands the selection
+	 * to the word at the caret position to do "lookups". Since we are overriding
+	 * the context menu we also need to override this expanding so the behavior becomes
+	 * normalized. Firefox on os x doesn't expand to the word when using the context menu.
+	 */
+	editor.on('mousedown', function (e) {
+		if (isMacWebKit() && e.button === 2 && !isNativeOverrideKeyEvent(e)) {
+			if (editor.selection.isCollapsed()) {
+				editor.once('contextmenu', function (e) {
+					editor.selection.placeCaretAt(e.clientX, e.clientY);
+				});
+			}
+		}
+	});
+
+	editor.on('contextmenu', function(e) {
+		var contextmenu;
+
+		if (isNativeOverrideKeyEvent(e)) {
+			return;
+		}
+
+		e.preventDefault();
+		contextmenu = editor.settings.contextmenu || 'link openlink image inserttable | cell row column deletetable';
+
+		// Render menu
+		if (!menu) {
+			var items = [];
+
+			tinymce.each(contextmenu.split(/[ ,]/), function(name) {
+				var item = editor.menuItems[name];
+
+				if (name == '|') {
+					item = {text: name};
+				}
+
+				if (item) {
+					item.shortcut = ''; // Hide shortcuts
+					items.push(item);
+				}
+			});
+
+			for (var i = 0; i < items.length; i++) {
+				if (items[i].text == '|') {
+					if (i === 0 || i == items.length - 1) {
+						items.splice(i, 1);
+					}
+				}
+			}
+
+			menu = new tinymce.ui.Menu({
+				items: items,
+				context: 'contextmenu',
+				classes: 'contextmenu'
+			}).renderTo();
+
+			menu.on('hide', function (e) {
+				if (e.control === this) {
+					visibleState = false;
+				}
+			});
+
+			editor.on('remove', function() {
+				menu.remove();
+				menu = null;
+			});
+
+		} else {
+			menu.show();
+		}
+
+		// Position menu
+		var pos = {x: e.pageX, y: e.pageY};
+
+		if (!editor.inline) {
+			pos = tinymce.DOM.getPos(editor.getContentAreaContainer());
+			pos.x += e.clientX;
+			pos.y += e.clientY;
+		}
+
+		menu.moveTo(pos.x, pos.y);
+		visibleState = true;
+	});
+
+	return {
+		isContextMenuVisible: isContextMenuVisible
+	};
+});