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And fail if missing.

+ Mark on FramedInputStream

Fixes #1

Fixes a bug where base128 was handled as LE regardless of actual
requested endianness.

This is a functional update to do what was intended. Writing LEB128 when
handling as BigEndian should be considered a bug, therefore a minor
release should be sufficient.

- Able to chain out to output stream, input from input stream.
- Simplified SubProcess wrapper to keep output and state.
- ForkingOutputStream writes to all, and is used to split stream between
  requested output stream and the string buffer.

And getting the current terminal size.