Refactor major components into their own files.
Suppress the status bar at the bottom.

Showing the window and pane size is no longer useful now that I have
auto-resize working properly.
Prettification (both code and GUI)

Set proper minimum sizes for the window and main content of my window so
we don't break the view by squashing things down. Also, fixup some of
the whitespace in my code for prettier layout.
Add File -> New Window menu item.
WIP of new-window system.