Changed compiler compliance to 11, modularized all packages (#16)

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

* Using JDK 11 as Build JDK and Maven build

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

src/main/java/envoy/data/package-info.java

@@ -0,0 +1,10 @@
+/**
+ * This package contains all data objects that are used both by Envoy Client and
+ * by Envoy Server Standalone.
+ *
+ * @author Leon Hofmeister
+ * @author Maximilian Käfer
+ * @author Kai S.K. Engelbart
+ * @since Envoy common v0.1-beta
+ */
+package envoy.data;

src/main/java/envoy/event/package-info.java

@@ -0,0 +1,10 @@
+/**
+ * This package contains all events that can be sent or received by Envoy Client
+ * or Envoy Server Standalone.
+ *
+ * @author Leon Hofmeister
+ * @author Maximilian Käfer
+ * @author Kai S.K. Engelbart
+ * @since Envoy common v0.1-beta
+ */
+package envoy.event;

src/main/java/envoy/exception/package-info.java

@@ -0,0 +1,9 @@
+/**
+ * This package contains all Envoy-specific exceptions.
+ *
+ * @author Leon Hofmeister
+ * @author Maximilian Käfer
+ * @author Kai S.K. Engelbart
+ * @since Envoy common v0.1-beta
+ */
+package envoy.exception;

src/main/java/envoy/util/package-info.java

@@ -0,0 +1,11 @@
+/**
+ * This package contains general useful classes that can be used by both Envoy
+ * Client and Envoy Server Standalone and that could not be assigned to any
+ * other package.
+ *
+ * @author Leon Hofmeister
+ * @author Maximilian Käfer
+ * @author Kai S.K. Engelbart
+ * @since Envoy common v0.1-beta
+ */
+package envoy.util;

src/main/java/module-info.java

@@ -0,0 +1,18 @@
+/**
+ * This module contains all packages that are used by Envoy Client and Envoy
+ * Server Standalone at the same time.
+ *
+ * @author Leon Hofmeister
+ * @author Maximilian Käfer
+ * @author Kai S.K. Engelbart
+ * @since Envoy common v0.1-beta
+ */
+module envoy.common {
+
+	exports envoy.data;
+	exports envoy.util;
+	exports envoy.exception;
+	exports envoy.event;
+
+	requires transitive java.logging;
+}