data-access refactor

- refactored into 2 sub-projects: api and core
- api and core contain each a .project and .classpath
- packages changed from (..)catalog.api(..) to (..)api.catalog(..)
- packages changed from (..)datasource.wizard.api(..) to (..)api.datasource.wizard(..)
- ant build process places api and core jars in data-access-v2 zip
- ant install process copies api jar into tomcat’s WEB-INF/lib
- added enunciate folder to .gitignore
- applied code-style check
- refactored data-access installed in a bi-server and tested REST endpoints (/pentaho/plugin/data-access-v2/api/datasourceWizard/templates, /pentaho/plugin/data-access-v2/api/datasourceCatalog/datasources)