Update samples and webAppCreator to gwt-maven-plugin 1.2.0 (#10162)

Author: tbroyer

samples/dynatablerf/pom.xml

@@ -118,7 +118,7 @@
       <plugin>
         <groupId>net.ltgt.gwt.maven</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>1.0.1</version>
+        <version>1.2.0</version>
         <executions>
           <execution>
             <goals>

samples/mobilewebapp/pom.xml

@@ -187,7 +187,7 @@
       <plugin>
         <groupId>net.ltgt.gwt.maven</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>1.0.1</version>
+        <version>1.2.0</version>
         <executions>
           <execution>
             <goals>

samples/validation/pom.xml

@@ -123,7 +123,7 @@
       <plugin>
         <groupId>net.ltgt.gwt.maven</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>1.0.1</version>
+        <version>1.2.0</version>
         <executions>
           <execution>
             <goals>

user/src/com/google/gwt/user/tools/templates/maven/pom.xmlsrc

@@ -69,7 +69,7 @@
       <plugin>
         <groupId>net.ltgt.gwt.maven</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>1.0.1</version>
+        <version>1.2.0</version>
         <executions>
           <execution>
             <goals>