Move build timestamp to parent pom.

NCPBuildBase/pom.xml

@@ -30,11 +30,6 @@
 
 Version updating is done for NCPPlugin mainly, expect the other poms version to change randomly rather.</description>
 
-  <properties>
-    <maven.build.timestamp.format>yyyy_MM_dd-HH_mm</maven.build.timestamp.format>
-    <buildTimestamp>${maven.build.timestamp}</buildTimestamp>
-  </properties>
-
   <build>
     <resources>
       <resource>

pom.xml

@@ -9,6 +9,8 @@
   <url>http://nocheatplus.org</url>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.build.timestamp.format>yyyy_MM_dd-HH_mm</maven.build.timestamp.format>
+    <buildTimestamp>${maven.build.timestamp}</buildTimestamp>
   </properties>
 
   <modules>