Merge WBSCInput and WBSCOutput types

[AloisSeckar]

Currently we have separate type WBSCInput to model user input and we are transforming it to WBSCOutput during evaluation process.

The types are largely the same. The most notable differences are WBSCOutput has text1 and text2 fields to represent text being printed out onto HTML Canvas and the extraOutput array to represent additional advances of the same player ("flat" array of 1-10 inputs is being mapped into 1-4 outputs with possible nested values).

Having the two types separately brings unnecessary (i.e. here) and even counter-intuitive (i.e. here) overhead. It should be possible to merge those structures into just one to avoid extra complexity.

The most challenging place to change should be renderAction method where the extra inputs for same player are handled recursively. The simpliest way to deal with this is to create the required structure on-the-fly in processAction before this loop.