Remove sclang debug posts on startup: "init_OSC", "initPassOne", "pass 1 done"

[nhthn]

this cherrypicks the most conservative commits out of #2431. this removes the following startup posts, which are not useful at all and were probably mistakenly left in:

init_OSC
initPassOne started
initPassOne done
pass 1 done

[telephon]

do we get an error message when osc init failed ?

[kisielk]

LGTM.

@telephon If we did before, we still will, otherwise I think this has no effect on any error messages.

[telephon]

so perhaps now we should, because we can't see that it has been initialized

[nhthn]

@telephon the init_OSC message was printed before osc was initialized, so it didn't signify success, just "we entered the init_OSC function." also, we do have some error messages in this function.

either way, it's not always a good idea to print a message if something is successful. are there cases where sclang boots without osc?