Fix bug 2658 where making a window traditional fullscreen in mavericks would cause another iterm window to become key

Fix bug 2694, which crashes when a dimmed color happens to be the same as a previously used color, and didn't get retained by CRunStorage because it used value equality instead of pointer equality.

Fix a bug where smart selection would include too much stuff before the text to select when there's a soft line break followed by a hard line break followed by the text that should be selected. Drop everything prior to the hard line break from consideration for smart selection.

Fix assert when right-clicking on a line with a lot of double width characters (or, presumably, certain kinds of combining marks) because we computed their screen positions incorrectly.

Use CTFontDrawGlyphs instead of -[NSAttributedString drawWithRect:options] for complex glyphs (bug 2639)

Add a backup to Gestalt since it seems to be failing some times. Fix IsMavericksOrLater, which actually tested against 10.7. Add a delay before asking for permission to control your computer since it appears under the window

Change instructions for enabling access for assistive devices for 10.9 (and have it open the right part of prefs using scripting). Switch to 10.9 SDK.

Make unblockPipeW nonblocking (pun not intended) to fix bug 2633. The PTYTask thread would get stuck in readTask waiting for the mainThread to complete -[PTYSession readTask:] while the main thread was stuck in -unblock waiting to write to unblockPipeW, which is only read by the PTYTask thread. Since unblockPipeW was blocking, it must have had a lot of pending writes that hadn't been read off, and dropping one on the floor won't matter because the thread will definitely get unblocked.