Move GeneralResource class to java "util" package

src/main/java/de/tudresden/inf/mci/brailleplot/brailleparser/PropertiesParser.java

 package de.tudresden.inf.mci.brailleplot.brailleparser;
 
-import de.tudresden.inf.mci.brailleplot.GeneralResource;
+import de.tudresden.inf.mci.brailleplot.util.GeneralResource;
 
 import java.io.InputStream;
 import java.util.Objects;

src/main/java/de/tudresden/inf/mci/brailleplot/configparser/JavaPropertiesConfigurationValidator.java

 package de.tudresden.inf.mci.brailleplot.configparser;
 
 
-import de.tudresden.inf.mci.brailleplot.GeneralResource;
+import de.tudresden.inf.mci.brailleplot.util.GeneralResource;
 import de.tudresden.inf.mci.brailleplot.printerbackend.PrinterCapability;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

src/main/java/de/tudresden/inf/mci/brailleplot/rendering/LiblouisBrailleTextRasterizer.java

 package de.tudresden.inf.mci.brailleplot.rendering;
 
-import de.tudresden.inf.mci.brailleplot.GeneralResource;
+import de.tudresden.inf.mci.brailleplot.util.GeneralResource;
 import de.tudresden.inf.mci.brailleplot.brailleparser.AbstractBrailleTableParser;
 import de.tudresden.inf.mci.brailleplot.configparser.Printer;
 import de.tudresden.inf.mci.brailleplot.layout.InsufficientRenderingAreaException;

src/main/java/de/tudresden/inf/mci/brailleplot/GeneralResource.java → src/main/java/de/tudresden/inf/mci/brailleplot/util/GeneralResource.java

-package de.tudresden.inf.mci.brailleplot;
+package de.tudresden.inf.mci.brailleplot.util;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

src/main/java/de/tudresden/inf/mci/brailleplot/util/package-info.java

+/**
+ * This package contains utility classes which can be invoked from all other packages.
+ */
+package de.tudresden.inf.mci.brailleplot.util;