Change obnoxious header to minimal header

[Se8870]

When someone uses #define YSI_NO_OBNOXIOUS_HEADER, show minimal header.

The reason why i push this? is because this is important especially if you're using YSI with SAFE_STARTUP.
I believe doing this will "decrease" lag, plus this header is important for letting people know that you are using YSI.

[Se8870]

One thing to note, i'm changing YSI_gsObnoxiousHeader with YSI_gsTitleHeader to avoid declaring two unused variable.
Thus, YSI_gsTitleHeader is a good "universal" name.

[Y-Less]

Could do with a tiny tweak on spacing, but otherwise looks good.

Also, I didn't align the old version to the centre of a 80-character terminal very well. Maybe that could be done as well (it's 42 characters wide, so left padding of 19 characters).

[Se8870]

Also, I didn't align the old version to the centre of a 80-character terminal very well. Maybe that could be done as well (it's 42 characters wide, so left padding of 19 characters).

What do you mean by this? 🤔
I think it's better to leave it to the left side to match with the server info tbh.