Fix rounding errors in arranging windows horizontally (e.g., width a screen width of 1676 and 3 windows). Also fix behavior on two monitors (keep windows on their own monitors)

Add RequestAttention proprietary escape code to master branch.

Fix bug where tools would become broken after becoming too short. Add Notes tool. Alphabetize tools. Add NSFileManager+DirectoryLocations.

Make toolbelt work in fullscreen mode. Fix bug where a tool title became selected on entering fullscreen.

Integrate flaub's ctrl-tab for MRU change with various minor fixes and refactorings, plus add bindable action for cycling tabs, and make that the new default global keymap, and remove the old profile keymap for ctrl tab.

Fix crash when closing a window because some toolbelt tools had a notification that fired after the pseudoterminal dies but after shutdown