added flag to do_replay_function that allows executing just one move
created new play_move function that uses modified do_replay function that uses modified do_replay function with new flag
added play single move replay button with callbacks to the function in replay_controller
specified modifications in changelog and release notes
Merge remote-tracking branch 'zappaman/replay_single_move'

Conflicts:
	RELEASE_NOTES
Fixed incomplete type build error in stage_sf_with_rca.hpp.