Add proper lookups for § and ± in key-bindings stringification

The (B) and (Z) models listed at
http://support.apple.com/kb/HT2841?viewlocale=en_GB have these keys
where the tilde/backtick key goes, but appear as '⌘ Hex Code 0xa7' in
the Keys prefs fields.
Flush user defaults after adding the hotkey window profile
Change zoom button to zoom to reduce confusion exposed in issue 3247
issue-3268 new files in place for dark tab style

Adds files for new dark tab style. Currently just a copy of Unified tab style.
issue 3268 dark tab bar BG

Dark tab bar actually has a dark background now, but nothing else.
issue 3268 changed tab font

Dark tab bar style now uses a monospace font in the tabs
issue-3268 Dark tabs draw right

Dark tabs and labels now draw correctly. Still need to add unfocused app and tab hover state.
issue-3268 Dark tab style looks nice now
issue-3268 Draw left tab separators
issue-3268 Removed unused code
Hide mirrored scroll view in title bar to fix issue 3244
Call updateContentShadow after adding a session. Issue 3264.
Add a bunch of tooltips
Get rid of content shadow. Turning it off on 10.10 doesn't work right. See issue 3252
Turn on widown shadow for only normal windows
Update shadow when toggling fullscreen
Handle nil account name
patch to give user the option of detaching tmux windows upon closing
Check if a file exists locally before trying to stat it for trouter. Should fix bug 3266.
small bugfix, also inform users that there is an option to detach in the alert window