Buffer Testing Improvements & Internal Code Cleanup

New Functionality:

1. Better error reporting for buffer testing functions xtd-setup= & xtd-return=.

Internal Functionality:

1. Cleanup and simplification of code.
2. All unnecessary macros removed or converted to functions.

Labeling Version 1.0.0 Release

v1.0.0

Minor corrections on readme including wrong function name, and spelling.