🎨 Log: look up unknown compile-time formatted enum values

[elbeno]

Problem:

• When an enumeration value is not named, but formatted at compile time, the resulting log string can potentially be post-processed by the decoder to recover the actual named enumeration value.

Solution:

• Post-process the log string during decoding and look up an enumeration values that are available.

For example, given the C++ code:

enum struct E {}; // no values
LOG("Value is {}", stdx::ct<E{42}>);

The resulting log string is "Value is (E)42".

Even though E has no values known to C++, if there is extra information in the JSON that the decoder can use:

"enums": {
  "E": {
    "42": "the_answer"
  }
}

Then the log string can be post-processed during decoding to read "Value is the_answer"