Make colored output optional in chisels

* Update ansiterminal to make disabling of colors possible. If a chisel
needs to have colored output, it must first run
ansiterminal.enable_color(true). To disable colored output (e.g. with
an optional argument), run ansiterminal.enable_color(false)
* spy_port: add an argument to opt out of colored output
* spy_ip: add an argument to opt out of colored output
* proc_exec_time: add an argument to opt out of colored output
* echo_fds: add an argument to opt out of colored output
docs: Update docs to include info on multiple chisel arguments