support <:^A> to force raw ANSI output

* ^A uses the default code page without colon, just like ^U/EU.
  This is usually UTF8, unless you run with --8bit.
  It would make just as little sense to inherit the codepage from the
  current document.
* Ensures that code like `:^A^E<0xFF>^A` really outputs byte 0xFF.
* DEC TECO doesn't have the colon modifier, but it has a colon modifier
  for ^T to enforce raw output.
  In SciTECO, the ^T vs. :^T distinction will also be between default codepage
  and ANSI. It makes sense because ^T should treat its numeric arguments like <I>
  for consistency.

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