JmeSystem: print build info on initialization

jme3-android/src/main/java/com/jme3/system/android/JmeAndroidSystem.java

@@ -145,7 +145,7 @@ public class JmeAndroidSystem extends JmeSystemDelegate {
             return;
         }
         initialized = true;
-        logger.log(Level.INFO, "Running on {0}", getFullName());
+        logger.log(Level.INFO, getBuildInfo());
     }
 
     @Override

jme3-core/src/main/java/com/jme3/system/JmeSystemDelegate.java

@@ -172,6 +172,15 @@ public abstract class JmeSystemDelegate {
         }
     }
 
+    public String getBuildInfo() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("Running on ").append(getFullName()).append("\n");
+        sb.append(" * Branch: ").append(JmeVersion.BRANCH_NAME).append("\n");
+        sb.append(" * Git Hash: ").append(JmeVersion.GIT_SHORT_HASH).append("\n");
+        sb.append(" * Build Date: ").append(JmeVersion.BUILD_DATE);
+        return sb.toString();
+    }
+    
     public abstract JmeContext newContext(AppSettings settings, JmeContext.Type contextType);
 
     public abstract AudioRenderer newAudioRenderer(AppSettings settings);

jme3-desktop/src/main/java/com/jme3/system/JmeDesktopSystem.java

@@ -369,7 +369,7 @@ public class JmeDesktopSystem extends JmeSystemDelegate {
         } catch (SecurityException ex) {
             logger.log(Level.SEVERE, "Security error in creating log file", ex);
         }
-        logger.log(Level.INFO, "Running on {0}", getFullName());
+        logger.log(Level.INFO, getBuildInfo());
     }
 
     @Override