Update Studio versioning rules generation for 9.3+

SITUATION
Currently Studio generates custom versioning rules for each document type with the following format:

<versioningRule typeName="MyCustomDoctype">
      <initialState major="0" minor="0"/>
      <options lifeCycleState="*">
        <none default="true"/>
        <minor/>
        <major/>
      </options>
</versioningRule>

PROBLEMS

• Customers are forced to make custom XML extensions for each document type if they want to change that versioning policy
  => We should make it easier to override the Studio generated policy for all doctypes at once

• This versioning mechanism is deprecated and will be removed with LTS 2017
  => We have to change the generated XML to follow the new flow

• The versioning rule provided by default in Studio makes no difference with the default Nuxeo Server configuration
  => It makes no sense to keep it

TODO
For target platform 9.3 and over:

• Don't generate versioning rules in the XML anymore