bluString: Added `Wrap` method
Replaced "bluStringArray" with "bluArrayString"

This is more practical. One tends not to need to greatly modify strings
once already in an array, and the modifications could be done externally
by a bluString; storing lots of bluStrings is not more efficient than
simple VB Strings, and this new approach is more befitting what I need
to do in OZ80.

* bluArrayString now handles the conversion from Variant to String
instead of bluString