Change rifle fallback mechanism for flag t

Rifle used to just fall back to using `xterm` when `flag t` was used and
`TERMCMD` didn't yield a valid command or the terminal emulator couldn't
be determined from the `TERM` variable.

Now when the need to fallback occurs rifle uses its own rules with a
custom mime type i.e. `ranger/x-terminal-emulator`. This way we can
provide a default sequence from rarer to more common terminal emulators
and users can change the fallback by editing `rifle.conf`

Fixes #1108

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