Refactor: Change bit-wise enumerations into defines.

Refactor: Change bit-wise enumerations into defines.

I did some reviewing of how the enumerations used for flags are used.
These generally are not being used as a type.
An enumeration slightly increases the resulting binary size.
Enumeration values might be limited to just type of int.

This seems like an easy (small) optimization to just use defines rather than enumerations for flags and other bit-wise numbers.