Fetch version and build code information from artifactory

pom.xml

.../java/de/tobias/playwall/controller/PluginController.java

...ll/infrastructure/ArtifactoryConfigurationProperties.java

...ias/playwall/infrastructure/ArtifactoryWebClientBean.java

src/main/java/de/tobias/playwall/model/Plugin.java

src/main/java/de/tobias/playwall/model/PluginManifest.java

...ain/java/de/tobias/playwall/model/artifactory/Folder.java

...in/java/de/tobias/playwall/model/artifactory/Version.java

...in/java/de/tobias/playwall/service/ArtifactoryClient.java

src/main/java/de/tobias/playwall/service/PluginService.java

...ain/java/de/tobias/playwall/service/VersionTokenizer.java