Roll-up LiveAction fields into ActionExecution
Roll-up LiveAction fields into ActionExecution

* Aim is to as much as possible promote meaningful LiveAction properties to
  ActionExecution in-order to enable replacement of LiveAction with ActionExecution.
* There are still fields in the LiveAction like context and callback which are
  necessary as runtime elements and should continue to remain with LiveAction.

dennybaa/st2,Plexxi/st2,Itxaka/st2,emedvedev/st2,jtopjian/st2,grengojbo/st2,armab/st2,dennybaa/st2,Plexxi/st2,peak6/st2,punalpatel/st2,nzlosh/st2,StackStorm/st2,emedvedev/st2,jtopjian/st2,lakshmi-kannan/st2,StackStorm/st2,tonybaloney/st2,jtopjian/st2,pixelrebel/st2,armab/st2,pixelrebel/st2,peak6/st2,pixelrebel/st2,alfasin/st2,alfasin/st2,tonybaloney/st2,pinterb/st2,pinterb/st2,nzlosh/st2,StackStorm/st2,StackStorm/st2,armab/st2,nzlosh/st2,grengojbo/st2,nzlosh/st2,alfasin/st2,dennybaa/st2,pinterb/st2,lakshmi-kannan/st2,punalpatel/st2,Itxaka/st2,Plexxi/st2,Itxaka/st2,tonybaloney/st2,grengojbo/st2,lakshmi-kannan/st2,emedvedev/st2,punalpatel/st2,Plexxi/st2,peak6/st2