json structure and get/set methods for controlling the display state of an alignment window

JalviewLite alignment views (or alignFrames) should provide two methods like:

JSON getAlignmentViewState()
void updateAlignmentViewState(JSON state)

The JSON structure would correspond to the attributes defining the current alignment view, and include things like:

{
  showUnconserved : true,
  globalColourScheme : 'ClustalX',
  wrapped : true,
  ..
}