0.7.0: allow Fixture to be a ContextManager

Signed-off-by: Erik Bernoth <erik.bernoth@gmail.com>
DONT PUSH THIS - Fixture loads config from root

Signed-off-by: Erik Bernoth <erik.bernoth@gmail.com>
WIP: add terminal control sequence handling

Signed-off-by: Erik Bernoth <erik.bernoth@gmail.com>