SDL_test: allow disabling colorized output

[madebr]

By running e.g. testautomation --no-color, the cli output will not contain color codes.

Description

Existing Issue(s)

[smcv]

Would it be straightforward to also disable the colorization if environment variable NO_COLOR has a non-empty value?

[madebr]

Would it be straightforward to also disable the colorization if environment variable NO_COLOR has a non-empty value?

SDL3 is also "batteries included" :D So that's no issue at all ;)

[madebr]

Would it be straightforward to also disable the colorization if environment variable NO_COLOR has a non-empty value?

The tests now support this (as long as they parse the arguments through the SDL_test functions).