Changed compiler compliance to 11, modularized all packages (#114)

* added module- and package-info.java, changed JRE from 8 to 11

* updated maven from Java 1.8 to 11

Co-authored-by: CyB3RC0nN0R <kske@outlook.de>

.github/workflows/maven.yml

@@ -9,9 +9,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up JDK 1.8
+    - name: Set up JDK 11
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 11
     - name: Build with Maven
       run: mvn -B package --file pom.xml