Warn about usage of with(Matcher<<BoxedNativeType>>)

[olibye]

The original source code support for that had to be moved from java to generated code as the java compiler no longer supports overloaded methods that overlap e.g.
...with(Object) ...with(Boolean)

The code that supports this in 2.8.X is generated with ASM and may not be supported in future run times.

Need to warn people to migrate to withInt withBoolean type methods.

Which sucks.