Invalidate selectedTabs only when necessary

(cherry picked from commit 95d31f07df9316685a04bde674e442fcd8a0f0df)
Fix colorStack option (#32)
TabBlur doesn't work
Move "Bookmark/Reload All Tabs" to all tabs popup
Turn off Copy/Paste Page Location shortcut keys by default
Add Ctrl+Shift+C to copy all page urls
Ctrl-Tab cleanup
Fix tab preview interferer with stacking tabs
Default/Recommended settings tuning
Merge branch 'cleanup' into develop
Tab Utilities 1.6pre17