Checkin release notes
Remove redundant code
Use NSImageNameAddTemplate image for “create new tab” button
Revert "Add “create tab” images from MMTabBarView"

This reverts commit 6a81bad1e4fefbc88588e024c9ac4a44b952127f.
Remove old tab close button images (for non-modified tabs)
Closing the overflow tab (via mouse) caused suboptimal relayout

When we close a tab with the mouse we “freeze” the layout rectangle of the tabs before the one closed, however, if this group contains non-visible tabs during close (as is mostly the case when showing the overflow button) then one of those would be made visible (since we closed a tab that took up space) and this new tab would be squeezed into the saved layout rectangle.
Make “Restore Session” default for session restore dialog

Since disabling session restore will discard user data, it should not be default.