Changes:
Buffers are appended to the end of the tab bar when created. This is a more intuitive experience for users of the tab browser familiar with other browsers.
Fix misalignment/rendering issue for the status area on WebEngine.
Add M-up and M-down command to dynamically resize the prompt buffer while it is open.
Fix ffi-prompt-buffer-focus API to broadly define a ffi-focus-buffer API. This will be useful for windows with multiple buffers side by side.
Add Emacs bindings M-n and M-p for switching between the next and previous tabs.