Copy and pasting does not work

[catruge]

Hello. On Windows and Linux, copy and pasting doesn't work. I suspect this is because the ctrl key plus c or v is prevented when a Text instances return true from onkeydown:

if (rtv.keys.ctrl) {
  this.properties[rtv.frame] = transform_props(
    key,
    this.properties[rtv.frame],
  );
  return true;
}

[catruge]

Hi. I got the clipboard fixed in #51.

[JonComo]

Will close this once we get it merged, thanks!