sdg-cli: setup fat jars and main class in manifest

        <maven.compiler.target>11</maven.compiler.target>

    </properties>

    <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-assembly-plugin</artifactId>

                <version>3.3.0</version>

                <configuration>

                    <archive>

                        <manifest>

                            <addClasspath>true</addClasspath>

                            <mainClass>tfm.cli.Slicer</mainClass>

                        </manifest>

                    </archive>

                    <descriptorRefs>

                        <descriptorRef>jar-with-dependencies</descriptorRef>

                    </descriptorRefs>

                </configuration>

                <executions>

                    <execution>

                        <id>assemble-all</id>

                        <phase>package</phase>

                        <goals>

                            <goal>single</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

    <dependencies>

        <dependency>

            <groupId>commons-cli</groupId>