Merge branch 'feature/contact-sync' into 'master'

...ore/src/main/java/net/jami/datastore/dao/AbstractDao.java

...tore/src/main/java/net/jami/datastore/dao/ContactDao.java

...store/src/main/java/net/jami/datastore/dao/DeviceDao.java

...store/src/main/java/net/jami/datastore/dao/SystemDao.java

datastore/src/main/java/net/jami/datastore/dao/UserDao.java

.../src/main/java/net/jami/datastore/dao/UserProfileDao.java

...tore/src/main/java/net/jami/datastore/main/DataStore.java

...java/net/jami/jams/common/dao/DeleteStatementBuilder.java

...n/java/net/jami/jams/common/objects/contacts/Contact.java

...mi/jams/common/serialization/database/DatabaseObject.java

...ams/server/servlets/api/auth/contacts/ContactServlet.java