Distinguish between _win_print() and _win_printf()

_win_print() and _win_printf() sound like they are the same. But
actually they are something totally different.

I renamed _win_print() to _win_print_internal() for that reason. It's
more about actually drawing to the ncurses window.

_win_printf() calls _win_print() and also writes the text to the window
buffer. Which _win_print() didn't, it was really just the ncurses
specific things.

In some cases there is _win_print_internal() called after a
buffer_append() in those cases it might be more correct to actually call
_win_printf().
It was not done so far. But probably is better. But will mean a bit more
operations.

I'll have to check this later.

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