Make it a class, since it has non-trivial behaviour for converting
the enumerated value to a uint32_t value. (Comply with style guide.)
Merge EnumCaseWithOperands into EnumCase.
Fixed an issue where some of the tests were testing
the wrong word with the wrong operation. (| != ||).
Coalesced the many versions of EnumCase into one.
Added a get_value() to EnumCase to convert to a uint32_t.
Replaces ASSERT_TRUE(pointer), with ASSERT_NE(nullptr, pointer),
so that we do not do implicit pointer->bool conversion.
Removed const from some test structs since gtest needs to be
able to swap them.
