Interactive tutorial

[mrshu]

In a551654 I introduced a bigger console window which is still just 200px high so we'll still fit on 1024x768 screens.

However, since there is more room for text now we could include something like an interactive tutorial. My idea is that user would type in tutorial and then he would get a simple explanation of functions which are available and so on.

@Adman what do you think?

[Adman]

Nice idea. Then this would run in another thread.