Rename release.sh to release_beta.sh. It is for releasing widely-deployed beta builds. release3.sh is for the early adopters.

Fix a bug where invoking weaklyReferencedObject on a weak reference would leak a reference count to the weakly referenced object.

Fix how keystrokes are sent to tmux. It wants code points, not raw bytes. This requires plumbing strings throughout the text-sending code. I also fixed a bunch of bugs where things were broadcast that shouldn't have been and added a TODO to fix broken UTF-8 mouse reporting. Some dead code removed.

Fix a bug where -[iTermTextExtractor rangeForWord:] would crash when dealing with surrogate pairs and composed characters because it incorrectly assumed cells were 1:1 with characters in strings.

Improve performance when there are many subselections. This happens when you have lots of (non-wrapping) lines selected and the session getes restored, which is probably a bug too.

Fix crash when trying to select output of command where the start of the output has been scrolled off history

Fix bug where three finger tap emulates middle button didn't work right because it failed to set the button number in the event. Issue 4652.

Remove Fowrard in Time action since the UI for instant replay has changed. Change Back In Time to Start Instant Replay.

Change the copy of the keystrokesBeingStolen preference to include Alfred, since it seems to have the same issue.

Make a double click on the first column of the password manager's table send the password. Issue 4639.