Add a menu item to show the tip of the day. This necessitated changing the Disable Tip button into a toggle, since you can now show tips while they're disabled.

Fix bug where indicatorRectForTabCell: called itself when tab numbers were hidden, causing unbounded recursion.

Hide the tab bar's icon if the indicator is showing. Move the indicator to the left of the shortcut.

Change thin strokes for aa text to have three settings: always, never, retina-only. Defaults to retina-only. Issue 4118.

Merge branch 'roandelyf/advancedTab' of https://github.com/roandelyf/iTerm2 into roandelyf-roandelyf/advancedTab

Store Character Encoding profile preference as an NSUInteger instead of int. This is both forward- and backward-compatible.

This property is accessed multiple times per table view reload. We were unnecessarily
recomputing the same value hundreds of times.

This patch also caches a global sorted settings, as this value is constant and is accessed multiple times.

Advanced tab load time decreased dramatically.

Move keyWindowIndexMemo out of iTermController and into HotkeyWindowController where it belongs, and rename it to a more sensible name.

Master

sync from upstream