Insert macro-generated implicit in companion object.

This project defines an annotation macro, MakeMeta, which generates an implicit object extending Meta[C] within the companion object of class C.

The object is properly generated as it can be accessed explicitely by its name, meta, but the compiler does not consider it a candidate for implicitly[Meta[C]] as I expected it would:

[error] .../implicit-generated-by-macro-in-companion/core/src/main/scala/org/experiment/Main.scala:13:
                could not find implicit value for parameter e: org.experiment.Meta[org.experiment.Dummy]
[error]     implicitly[Meta[Dummy]].info
[error]               ^
[error] one error found

Note that, while it looks like an implicit macro could do what I want, i.e. have an implicit instance of a type class generated for a given case class, I'd rather use an annotation macro for three reasons:

1. The classes will be annotated for reasons other than the code generation needs presented here.

2. The annotation macro offers control as to when/where the implicit instance is created, which the implicit macro does not: compilation of the annotated instance vs any location where the implicit is looked up.

3. The annotation macro in the actual project is more complex and performs much more involved operations than the toy version presented here.