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 https://github.com/roboticslab-uc3m/color-debug/pull/15, they look rather grayish. This is easier to spot when having both CD output and YARP log messages.