Update list.py: add list class

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update tool.py: add '[<field>]' to list

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update tool.py & list.py: add '--field'

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>