[cc65] New 80 col switch API

Hi,

Some years ago I planned to implement C library support on the Apple
//e for switching to 80 col mode and back. I asked Uz if I should
implement the existing C128 API toggle_videomode(). Uz told me that he
was quite unhappy with toggle_videomode() - for obvious reasons - and
that I should rather follow the style of i.e. textcolor(): One
parameter and the return value giving the previous setting.

As 80 col mode switching is the feature asked most for on the Apple
//e I'm about to implement it now for the upcoming cc65 release. So it
makes sense to replace the exsisting toggle_videomode() with the "new"
API on the C128 too. As far as I understand ZP location $D7 ('mode')
allows to determine the current setting so this seems very easy to do.
Anyway I'd prefer this change being made by a "regular" CBM
contributor.

From my perspective the actual "new" API could look like this:

unsigned char __fastcall__ videomode (unsigned char mode);

#define VIDEOMODE_40COL 0x??
#define VIDEOMODE_80COL 0x??

Thanks in advance, Oliver
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