Remove setting: `monitor_focus_fallback`

“There's only one way to do it.”

And a window selection shall always return a node.
Don't transplant when swapping

The new syntax provides a separate transplantation option.
Merge pull request #34 from Stebalien/fixup-control-flags

Remove `<file_path>` arguments from control flags.
Merge pull request #35 from Stebalien/expand-selector-documentation

Expand selector documentation
Fix small typo