add ITable and TableProxy
isolate org.hibernate.tool.hbm2x.Cfg2HbmTool and replace by org.jboss.tools.hibernate.spi.ICfg2HbmTool
add Cfg2HbmToolProxy implementations in org.jboss.tools.hibernateX_Y plugins
add IProperty and PropertyProxy
move ITableFilter to plugin org.jboss.tools.hibernate.spi