wiring-classes directory should be created in target/ in DevMojo

[gsmet]

Currently, we create temp directories in /tmp/ and they are not properly cleaned up: deleteOnExit() only deletes empty directories and in most cases, the created wiring-classes directory is not empty.

As we are using the default build directory when in dev mode, we should also probably use the target/wiring-classes directory.

This if the wiring classes are not specific to the dev mode, if they are, we should create a specific directory in target/, we don't want to create directories outside of it.