#9 improved Demo-mode

[Hans-Joachim Gurt]

For several games, the demo-mode is bad,
and some have no demo at all, e.g.:
* Matrix-type (not working),
* Tower of Hanoi (bad - does not solve)
* Poker-Puzzle (none)

Also, it would be nice to have more detailed control for demo-mode, eg. Start / Pause / Stop /
Repeat same game / Continuous-with-next-gamenumber / Continuous-with-random-gamenumbers /
Cycle thru list of game-numbers