Add optional argument to specify if boss weapons will receive the two default attributes

[naydef]

This addition is for FF2v2.0. I have seen many bosses, which have 200% damage bonus attribute an +2 capture speed bonus and for example -80% damage or negative capture speed attribute. The second attribute counters the first, which is stupid. Instead of giving default attributes, let the boss creators select if they want default attributes.

[shadow93]

Or let's ditch built-in attributes altogether if custom attributes are specified.