Change variable name where store log directory to "log4j.dir"

Author: Mattia Bertorello

app/src/log4j2.xml

@@ -8,8 +8,8 @@
     </Console>
 
     <!-- Rolling File Appender -->
-    <RollingFile name="RollingFile" fileName="${sys:log4j.saveDirectory}/logs/application.log"
-                 filePattern="${sys:log4j.saveDirectory}/logs/application-%d{MM-dd-yyyy}-%i.log.gz"
+    <RollingFile name="RollingFile" fileName="${sys:log4j.dir}/logs/application.log"
+                 filePattern="${sys:log4j.dir}/logs/application-%d{MM-dd-yyyy}-%i.log.gz"
                  ignoreExceptions="false">
       <PatternLayout>
         <Pattern>%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX}{UTC} %p %c{1.}:%L [%t] %m%n</Pattern>

app/src/processing/app/Base.java

@@ -208,7 +208,8 @@ public Base(String[] args) throws Exception {
 
     BaseNoGui.initPortableFolder();
     // This configure the logs root folder
-    System.setProperty("log4j.saveDirectory", BaseNoGui.getSettingsFolder().getAbsolutePath());
+    System.out.println("Set log4j store directory " + BaseNoGui.getSettingsFolder().getAbsolutePath());
+    System.setProperty("log4j.dir", BaseNoGui.getSettingsFolder().getAbsolutePath());
 
     // Look for a possible "--preferences-file" parameter and load preferences
     BaseNoGui.initParameters(args);