change default arguments like unicode to be automatically

[MCWertGaming]

Currently, unicode has to be set manually - eiter on or off. I think that we should try to detect unicode support on runtime instead.

[MCWertGaming]

For linux:
https://www.rosettacode.org/wiki/Terminal_control/Unicode_output#C

[flagarde]

@MCWertGaming this check locale support utf8 but terminal can be configured to use other encoding. I provide a very basic utf8 terminal support detection in #294, seems to work so far. I adapt the code to use it on windons*.cpp but it need more cleaning in other PR