moved mapping related updates into plugins

- mapping updates moved to moveplugin an setplugin
- humanclient integrated back into gameclient.ts
- htmlmapping now part of game
- card and layout setup moved to _common.html (from the humanclient
setup) - only needs to be performed once
- function performCommand changed to updateBoard
- new function updateMapping added to support mapping updates
- function UpdateCommands chnaged to BroadcastCommands