More...Setting up CPU code

- Fixed a number of references (registers, types, etc.) in whole
document
- Added addressing modes
- NOTE: Temporary placeholder for reading CPU memory.  Needs to be setup
to properly read PRG memory like the C# version
- Changed page change checking to eliminate unnecessary step.  One of
the functions (pageChangeCheck();) was simply converting and returning
the bool value bolPageChanged.  Instead, I just made that value an int
(now pageChangedOffset) and added it directly to the cpuCycles and
deleted the pageChangeCheck() function.