Apache PLC4X 0.7.0

This version is the first after a major refactoring of the driver
core. All previous driver versions are now considered deprecated
and have been replaced by versions using the new driver structure
and generated driver codebase.

New Features

• Drivers now support structured types using PlcValues
• The EIP (EtherNet/IP) driver no longer requires an external
  library and is implemented fully in the PLC4X project
• The Modbus driver no longer requires an external library
  and is implemented fully in the PLC4X project
• The new S7 Driver supports writing multiple entries in one
  request (The API allowed this from the beginning now not
  every item is wrapped in a single request. It should bring
  significant performance gains when writing multiple vlaues)
• S7 Driver now supports String datatypes.
• OSGi : Implementation of Drivers/Transports as OSGi services
  to be able to use them in an OSGi container.
• New Firmata protocol driver

Incompatible changes

• Due to the refactoring of the driver core there might be issues
  running drivers built against older core versions.
• This version doesn't provide a Beckhoff AMS/ADS driver as this
  driver is still being ported to the new mspec format.
• All drivers connection strings now follow the same pattern:
  {protocol-code:(transport-code:)?//{transport-config}(?{params})?
  Please check the drivers documentation on our website:
  https://plc4x.apache.org/users/protocols/s7.html
• The karaf-feature modules are removed as the drivers now all
  provide both a feature.xml as well as a kar bundled archive

Bug Fixes

PLC4X-174 UDP Transport does not accept ports containing 0
PLC4X-134 S7 is terminating the connection during handshake
PLC4X-192 Support for conversion of complex connection string
parameters