tracef should not emit a newline at the end about wasm4

[jacereda]

Maybe a SYSTEM_FLAG to opt-in as I suggested in #611 (comment)

[LunaAmora]

Yeah, i would prefer to have both versions as one without a newline would facilitate printing various stuff in the same line (in my case, cause I like creating toy Langs, so i would have to implement string buffers first if i would like to print stuff that is more complex). But when i asked why it was this way, @aduros said on discord:
"Yeah, the intent was to have a drop in replacement for console.log() for debugging, and not fully expose stdout"

So i guess it is intended to not support this :/

[Ruulul]

it is possible tho to use ANSI control codes to print on the line above, move the cursor, clear the terminal...
https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797

came pretty handy on debugging real time information to me