Add release plugin configuration

We need to enable all of the OS-specific profiles so the version numbers
of all the modules are bumped.

In turn this means we need to avoid calling the verify target during
release:prepare, as we can't build all the modules on any platform.

Similarly, we can't actually call the deploy target during
release:perform. We instead call `mvn -Prelease deploy` on each
supported operating system/architecture manually.

pom.xml

@@ -90,6 +90,15 @@
           </java>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-release-plugin</artifactId>
+        <configuration>
+          <releaseProfiles>release,mac,unix,windows</releaseProfiles>
+          <preparationGoals>clean</preparationGoals>
+          <goals />
+        </configuration>
+      </plugin>
     </plugins>
   </build>