Fix line strike.

Fix code block wrapping.
Fix replyModel being garbage collected.
Reply message in RoomPanelInput is richtext now.

src/utils.cpp

@@ -1,15 +1 @@
 #include "utils.h"
-
-QString utils::removeReply(const QString& text) {
-  QString result(text);
-  result.remove(utils::removeRichReplyRegex);
-  result.remove(utils::removeReplyRegex);
-  return result;
-}
-
-QString utils::cleanHTML(const QString& text) {
-  QString result(text);
-  result.replace(codePillRegExp, "<i>\\1</i>");
-  result.replace(userPillRegExp, "<b>\\1</b>");
-  return result;
-}