Ported r2822 from ZXing

Original commit message: "AztecWriter improvements from fyellin"
Add Objective-C wrappers around BOOL and int arrays
Wrappers for C arrays - WIP
wip2
wip3
Fix ReedSolomonTestCase
More int array conversions
More array wrappers
Update comments to better match Javadocs from ZXing

Also rename constants to include "ZX_" prefix
Various speed improvements

Most of these are due to removing unnecessary method calls for
properties.
More performance tweaks