Completely changes program interface. Now we have commands "robot,
"file", "role", "music", "list", "start" and "exit". Commands
"robot", "file", "role", "music" have arguments like "-add",
"-delete" ant etc. Every commands code extracted to the separated file.
Adds command load, which allow to load dance scenario from file.
Scenario appears in file as sequence of commands. Also adds ability
to connect by robot's name. Port in this case defines by file
"dancers.txt".