Provides a way to go from a enum value name string to an actual enum value.
```
E :: enum { A, B }
// ...
s := "B";
v, ok := enum_from_name(E, s);
assert(ok && v == E.B);
```
Provides a way to go from a enum value name string to an actual enum value.
```
E :: enum { A, B }
// ...
s := "B";
v, ok := enum_from_name(E, s);
assert(ok && v == E.B);
```