Main menu system

[GoogleCodeExporter]

The engine is currently lacking a general purpose main menu system. Currently, 
a crude main menu with scene selections may be added with a choice event, but 
this is suboptimal.

Possible approaches:
* Define a special menu file which is parsed with a separate parser. Needs to 
be made flexible enough to allow different structures.
* Define a special menu JavaScript file. This would leave the design to the 
hands of the novel writer, though it would also allow execution of any 
arbitrary script.

Original issue reported on code.google.com by [email protected] on 22 Jun 2012 at 2:27