Allow users to customize color output (foreground+background!!)

[jgvictores]

Allow users to customize color output.

Why?
At #20 @PeterBowman mentioned Allow users to disable color output because certain colors are not as nicely rendered as on (...) and even hard to read .

Where?
Some options:

1. CMake parameter?
2. Via .colordebugrc file? Nice idea, but ouch! we need code (aka more stuff in .c).
3. EDIT: (difficult-to-implement) CMake that parses .colordebugrc file

How?
Here are some links, best first:

• https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
• EDIT: https://github.com/rcfox/C-Header-For-ANSI-Colors shows us SGR is awesome and has cool things like bold and <blink>blink</blink> and even Fraktur, the later rarely supported per https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters
• https://www.linuxquestions.org/questions/programming-9/who-knew-about-printf-in-c-being-able-to-specify-foreground-background-colors-845683/ -> http://www.termsys.demon.co.uk/vtansi.htm
• Ncurses http://tldp.org/HOWTO/NCURSES-Programming-HOWTO/color.html
• Tput https://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/x405.html

The last two are plain documentation, we'd have to go to the source.

[jgvictores]

PS: If we ever do this, for #19 via ansicon it should also be supported per https://github.com/adoxa/ansicon/blob/eccbbe7a547f0ff8a3e7e6b6b3eaaa3d7563ae4d/ANSI.c#L331-L369

[jgvictores]

PS: Related to #5 (Windows 10 color console), the blog entry mentioned in the description also has an SGR section: https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences#example-of-sgr-terminal-sequences

[jgvictores]

While https://github.com/ikalnytskyi/termcolor is implemented as c++ stream manipulators, other projects in other languages present diffent APIs: chalk, colors.

[PeterBowman]

At #20 @PeterBowman mentioned Allow users to disable color output because certain colors are not as nicely rendered as on (...) and even hard to read .

Not really related to this issue, but related to that comment of mine: I just noticed that white colors (CD_INFO) are not really white since #15, they look rather grayish. This is easier to spot when having both CD output and YARP log messages.