BMGame now reports skills to the UI explicitly

BMGame now provides information about skills via JSON in the 'data' array, property 'dieSkillsArrayArray'.

dieSkillsArrayArray has the format:

    array('1' => array('Focus' => 'BMSkillFocus'), array())

if no dice have any skills apart from die 1 (i.e., the second die) of the first player.


Fixes #358.

This should be applied after pull request #402 because it has already merged that content.