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Zoning a Display

## Display Zones

A zone is a contiguous sequence of one or more display modules (LED matrices) and has all the attributes of the original displays - animation, speed, font, spacing, etc. This allows complex displays to be created. For example, one part can show relatively static text while a different one has animation and movement.

From version 2.0 of the library, a matrix display can be treated as a single contiguous set of modules or it can be split into multiple 'virtual' displays (zones). Prior to version 2.0 of the library, each display was effectively a single zone.

For backward compatibility, all the previous methods remain. If the new library is compiled with older user source code, the library defaults to using a single zone for the whole display. New zone-aware functions have an added parameter to specify the zone to which the method invocation applies. Methods invoked without specifying a zone (such as set*()) usually have their effect applied to all zones. This detailed in the class documentation.