Use Spring Boot Configuration Metadata for auto-completion of app pro…

…perties in IDE jmix-framework/jmix#224

JmixBuildPlugin adds annotationProcessor for Jmix modules;
Javadoc in existing ConfigurationProperties classes moved from getters to fields in order to be better displayed in IDE hints while application.properties file is being edited;

localfs/src/main/java/io/jmix/localfs/LocalFileStorageProperties.java

@@ -22,6 +22,10 @@
 @ConfigurationProperties(prefix = "jmix.localfs")
 @ConstructorBinding
 public class LocalFileStorageProperties {
+
+    /**
+     * {@link LocalFileStorage} storage directory. If not set, {@code jmix.core.work-dir/filestorage} will be used.
+     */
     String storageDir;
 
     public LocalFileStorageProperties(
@@ -30,7 +34,7 @@ public LocalFileStorageProperties(
     }
 
     /**
-     * {@link LocalFileStorage} storage directory. If not set, {@code jmix.core.workDir/filestorage} will be used.
+     * @see #storageDir
      */
     public String getStorageDir() {
         return storageDir;