Get things mostly building on Java 9.

This upgrades a bunch of Maven plugins, upgrades Proguard to 6.0, and adds some
fiddly profile stuff to point Proguard at the right set of JDK jmods since
rt.jar no longer exists for Java 9, and ignores a bunch more samskivert library
stuff since it references Java modules that we don't use (like java.sql).

pom.xml

@@ -109,7 +109,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.3</version>
+        <version>3.7.0</version>
         <configuration>
           <source>1.7</source>
           <target>1.7</target>
@@ -127,7 +127,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-resources-plugin</artifactId>
-        <version>2.7</version>
+        <version>3.0.2</version>
         <configuration>
           <encoding>UTF-8</encoding>
         </configuration>
@@ -136,7 +136,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.10.3</version>
+        <version>3.0.0-M1</version>
         <configuration>
           <quiet>true</quiet>
           <show>public</show>
@@ -147,23 +147,23 @@
       <plugin>
         <groupId>com.github.wvengen</groupId>
         <artifactId>proguard-maven-plugin</artifactId>
-        <version>2.0.8</version>
+        <version>2.0.14</version>
         <executions>
          <execution>
            <phase>package</phase>
-           <goals><goal>proguard</goal></goals>
+            <goals><goal>proguard</goal></goals>
          </execution>
         </executions>
         <dependencies>
           <dependency>
             <groupId>net.sf.proguard</groupId>
             <artifactId>proguard-base</artifactId>
-            <version>5.1</version>
+            <version>6.0.3</version>
             <scope>runtime</scope>
           </dependency>
         </dependencies>
         <configuration>
-          <proguardVersion>5.1</proguardVersion>
+          <proguardVersion>6.0.3</proguardVersion>
           <outputDirectory>${project.build.directory}</outputDirectory>
           <outjar>${project.build.finalName}.jar</outjar>
           <injar>${project.build.finalName}.jar</injar>
@@ -172,8 +172,21 @@
               <inclusion>
                 <groupId>com.samskivert</groupId>
                 <artifactId>samskivert</artifactId>
-                <filter>!**/Log4JLogger*,!**/*.java,com/samskivert/Log.class,**/samskivert/io/**,
-                        **/samskivert/swing/**,**/samskivert/text/**,**/samskivert/util/**</filter>
+                <filter>
+                  !**/*.java,
+                  !**/swing/RuntimeAdjust*,
+                  !**/swing/util/ButtonUtil*,
+                  !**/util/CalendarUtil*,
+                  !**/util/Calendars*,
+                  !**/util/Log4JLogger*,
+                  !**/util/PrefsConfig*,
+                  !**/util/SignalUtil*,
+                  com/samskivert/Log.class,
+                  **/samskivert/io/**,
+                  **/samskivert/swing/**,
+                  **/samskivert/text/**,
+                  **/samskivert/util/**
+                </filter>
               </inclusion>
               <inclusion>
                 <groupId>jregistrykey</groupId>
@@ -201,7 +214,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.6</version>
+        <version>3.1.0</version>
         <configuration>
           <archive>
             <manifest>
@@ -222,7 +235,7 @@
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>
-        <version>1.6.6</version>
+        <version>1.6.8</version>
         <extensions>true</extensions>
         <inherited>false</inherited>
         <configuration>
@@ -323,6 +336,28 @@
         <rt.jar.path>${java.home}/lib/rt.jar</rt.jar.path>
       </properties>
     </profile>
+    <profile>
+      <id>java-9-jdk</id>
+      <activation>
+        <file><exists>${java.home}/jmods/java.base.jmod</exists></file>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>com.github.wvengen</groupId>
+            <artifactId>proguard-maven-plugin</artifactId>
+            <configuration>
+              <libs>
+                <lib>${java.home}/jmods/java.base.jmod</lib>
+                <lib>${java.home}/jmods/java.desktop.jmod</lib>
+                <lib>${java.home}/jmods/java.logging.jmod</lib>
+                <lib>${java.home}/jmods/jdk.jsobject.jmod</lib>
+              </libs>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
 
     <!-- finagling to deal with plugin.jar not being bundled with OpenJDK -->
     <profile>