Customizable colorama colors

[jovanbulck]

allows a user to specify custom colors and style for the Colorama communicator via optional cli arguments:

# arguments = ok_color, wait_color, err_color, style
./kotnetcli.py -c green cyan yellow normal -d

The implementation also serves as a proof-of-concept on how to customize communicators without sacrificing cohesion and separation of concerns. This is done using constructor arguments passed through the factory, allowing the front-end to get the parameters from the user in any way. Here it's done through cli arguments; analogously it can be done through a GUI, config file, etc.

Note that, to support multiple command line arguments, I had to let go the add_mutually_exclusive_group(). While my solution doesn't report an error on adding multiple conflicting options (for now), it only executes one option (as defined by the elif switches) and furthermore allows grouping in the help messages:

Note that currently mutually exclusive argument groups do not support the title and description arguments of add_argument_group().

Lastly, the debug option is improved in that it requires an argument of choices=[ 'critical', 'error', 'warning', 'info', 'debug' ] and defaults to debug if option present but no level specified

[jovanbulck]

kotnetcli -h dump:

usage: Script om in- of uit te loggen op KotNet [-h] [-v] [-l] [-d [LEVEL]] [-i] [-o] [-k] [-f] [-g] [-t] [-c COL COL COL COL]

optional arguments:
  -h, --help            show this help message and exit
  -v, --version         show program's version number and exit
  -l, --license         show license info and exit
  -d [LEVEL], --debug [LEVEL]
                        specify the debug verbosity

worker options:
  -i, --login           Logs you in on KotNet (default)
  -o, --logout          Logs you out off KotNet

credentials options:
  -k, --keyring         Makes kotnetcli pick up your credentials from the keyring (default)
  -f, --forget          Makes kotnetcli forget your credentials
  -g, --guest-mode      Logs you in as a different user without forgetting your default credentials

communicator options:
  -t, --plaintext       Logs you in using plaintext output
  -c COL COL COL COL, --color COL COL COL COL
                        Logs you in using colored text output (default); arguments = ok_color, wait_color, err_color, style

[GijsTimmers]

Looks good, merged. Thank you!