Added named colour support + rgb colour support in config files.

[ClementTsang]

Description

Adds named colour support + rgb colour support to config files. Prior to this, only support for hex codes was available - now, we support 3 methods of colour naming.

So, this is now totally valid:

ram_color="0, 0, 255"
swap_color="#fffeee"
rx_color="magenta"

An example of this using purely "magenta" in most fields:

Issue

Issue: #15

Type of change

Remove the irrelevant one.

• New feature (non-breaking change which adds functionality)

Checklist

• Code has been linted
• Code has been self-reviewed
• Code has been tested and no new breakage is introduced
• Documentation has been added

Other information

Provide any other relevant information.