Filterm lets you run a child process while piping all terminal data to and from the child through a custom filter. This lets you modify things like ANSI escape sequences that get sent from the child.
The main way of using Filterm is to define a custom filter by implementing
the [FilterHooks] trait, and then call [run].
For an example of Filterm in use, see Monoterm.
Filterm has been tested on GNU/Linux. It may work on other Unix-like operating systems, as it avoids using Linux- and GNU-specific functionality.