Improve readability by removing #defined strings

[paulbartell]

Remove macro-defined string constants that are used in a limited number of places or are obvious.

[kstribrnAmzn]

I'm just going to state my opinion here which I realize is different from many on our team for the record....

In general, I'm a fan of removing single character and one use macros. I'm not really a fan of removing multi-character, multi-use macros. I'm okay with removing length macros as long as there is context where the raw value is used.

Essentially I think the macro name gives context more than anything, and I don't want to lose this context as it may result in future new developers suffering a harsher learning curve.

/stepping-of-my-soap-box