Disable High Sierra's system tabs, which you can get when System Prefs > Docks > Prefer tabs when opening documents is set to Always. Issue 6096

Add a pref to toggle the division view (the line under the title bar) when there is no tab bar. Issue 4671

Add support for Unicode 9 as an option, but it's off by default. This is based on Keno Fischer's work in pull request 294. It adds a new escape sequence: "OSC 1337 ; UnicodeVersion= Ps ST" where Ps is a number (8 or 9, presently) to switch to; 0 for the terminal's default (currently 8; I'm not sure this is very useful, though, since it loses the profile's preferred version--better to use the stack or DECSC/DECRC described later); push to save the current value onto a stack; pop to pull the last value off the stack. The unicode version is also saved and restored with the cursor (affected by DECSC, DECRC, and DECSET 1049). The unicode version and stack are saved and restored along with the rest of the terminal's state using window state restoration. Additionally, a new setting was added under Prefs/Profiles/Text to set the initial unicode version for the profile.

Add a menu item to the Toolbelt menu to save the current toolbelt's width as the default. Set the width from the pref the first time it is shown in a window.

Merge in code from hotkeyWindowsInPanels branch. Support multiple hotkey windows. Update the shortcut input view. Add support for floating panel terminal windows.

Default to release versions of iTerm2. For the next month, ask non-early-adopter, non-nightly, beta-receiving, auto-updating users if they'd like to continue getting beta versions

Removed 2 ceil() calls before, but idiotically didn't remove the rest of the tests they were part of, leaving behind essentially 2 x == x noops.

Correct a couple of working but technically wrong casts.

Fixes: https://gitlab.com/gnachman/iterm2/issues/4105

PTYSession.m (before):
// Unfortunately, this preference has been saved as a 32-bit int for a while, although it should
// be an unsigned 64 bit. Luckily, 32 bits happens to be enough so far, since enabling 64-bit
// storage is in the profile prefs system is somewhat involved. For now, hack off the sign
// extension.
[self setEncodingFromSInt32:[iTermProfilePreferences intForKey:KEY_CHARACTER_ENCODING inProfile:aDict]];
[...]
// See note at call site about why this exists.
- (void)setEncodingFromSInt32:(int)intEncoding {
    NSStringEncoding encoding = intEncoding;
    encoding &= 0xffffffff;
    [self setEncoding:encoding];
}

ProfilesTerminalPreferencesViewController.m (before):
// Unfortunately, character encoding should have been stored as a NSUInteger all along :(
// See notes in PTYSession for more details.
NSInteger tag = [self intForKey:info.key];
tag &= 0xffffffff;
[_characterEncoding selectItemWithTag:tag];

Change prefs in appearance from Hide to Show, which makes more sense (no double negatives when they're off)

Add a control to appearance prefs for whether to show tabs in fullscreen. Make the setting affect all windows rather than having a per-window setting.

Get rid of hold cmd to show tabs in fullscreen. Allow holding cmd to extend how long tabs are shown in fullscreen.

Set NSScrollViewShouldScrollUnderTitlebar instead of trying to swizzle -[NSTitlebarContainerView addSubview:], which caused issue 3499.

Conflicts:
	sources/PTYSession.h
	sources/PTYTextView.m
	sources/iTermTextExtractor.h

Get rid of animated dimming and fix a bug where tmux split pane title bars would not have the correct text color at creation time

Add preference for double-click to do smart selection (actually, it swaps double- and quad- click behaviors, but many users never discover quad click so I don't want to make the prefs text too verbsoe).

When pasting a string with tabs, show just one alert that includes an accessory for picking the tabstop size

Move source into sources/ directory. Delete a few unused images in the process and fix a reference to an Aqua image in FindView