Propagate info about last move via net::Move class

[aryjczyk]

Information about last move should be presented to players to make tracking state of the board easier. Info should contain which player moved, move origin and destination and any additional details(i.e. capturing pieces, promotions, checks). To prevent case bloat these details should be generalized as : a list of fields to highlight, a list of lines between fields and string containing exact info. There should be only a few predetermined highlight/line styles. Collections of such class could be used to save game course.