Update ACE Editor to version 1.2.9

The new ACE editor introduces full support for emojis (and, thereby, UTF-16 characters with high- and low-surrogates). Hence, we can remove our custom fix.

Further, this update will allow emojis to be used in pair programming sessions.

vendor/assets/javascripts/ace/snippets/rst.js

@@ -0,0 +1,29 @@
+define("ace/snippets/rst",["require","exports","module"], function(require, exports, module) {
+"use strict";
+
+exports.snippetText = "# rst\n\
+\n\
+snippet :\n\
+	:${1:field name}: ${2:field body}\n\
+snippet *\n\
+	*${1:Emphasis}*\n\
+snippet **\n\
+	**${1:Strong emphasis}**\n\
+snippet _\n\
+	\\`${1:hyperlink-name}\\`_\n\
+	.. _\\`$1\\`: ${2:link-block}\n\
+snippet =\n\
+	${1:Title}\n\
+	=====${2:=}\n\
+	${3}\n\
+snippet -\n\
+	${1:Title}\n\
+	-----${2:-}\n\
+	${3}\n\
+snippet cont:\n\
+	.. contents::\n\
+	\n\
+";
+exports.scope = "rst";
+
+});