v0.7.0

After migrating several projects with my fellow @RobertoNegro and listening to different opinions we have decided to simplify the package. From now on, I will consider a pure enum as a StringBackedEnum with names as values, so all ***AsSelect() methods will be replaced by ***ByValue() methods.

• added definition of description(), descriptions(), descriptionsByName(), descriptionsByValue() to improve code completion and static analysis
• removed all methods `***AsSelect()
• removed NotBackedEnum exception
• added support on ***ByValue() methods also for pure enum using name instead value
• merged version number with datomatic/enum-helper