protobuf-maven-plugin 0.7.0

Fork of xolstice/protobuf-maven-plugin based on this commit from August 2020 (the latest release 0.6.1 was in Oct 2018) of the forked repo with the following additions:

• Use shared repository for protobuf binaries to prevent a sporadic build failure on Linux when
  executing the protoc binary. The shared repository is located at the project's top level
  directory under .mvn/protobuf-binaries.
  This is enabled by default, can be disabled by setting the new configuration option
  useProtocBinaryRepository to false.
• xolstice#77

In addition to version 0.6.1:

• Fix file descriptor leak commit
• Support passing option to Java compiler commit
• Respect attach flag for descriptor set goals commit
• Use pb insead of protobin for binary descriptors commit

Plus quite a few dependency updates.