v1.0.0-rc2

• The dataSpecification field in EmbeddedDataSpecification is made optional, according to the book.
• Add release maven build profile
  • This allows execution of mvn install, mvn package, phases without execution of the gpg sign plugin for local testing and development.
• Fix camel case for the setter names in the builder types.

aas-core3.0-java 1.0.0-rc1

This is the initial release candidate version, ready for first reviews.