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;

data/src/main/java/io/jmix/data/DataProperties.java

@@ -29,6 +29,10 @@ public class DataProperties {
     boolean useReadOnlyTransactionForLoad;
     int numberIdCacheSize;
     boolean useEntityDataStoreForIdSequence;
+
+    /**
+     * Overridden pattern to parse Unique Constraint Violation exception
+     */
     String uniqueConstraintViolationPattern;
     boolean useUserLocaleForRelativeDateTimeMoments;
 
@@ -58,7 +62,7 @@ public boolean isUseEntityDataStoreForIdSequence() {
     }
 
     /**
-     * @return Overridden pattern to parse Unique Constraint Violation exception
+     * @see #uniqueConstraintViolationPattern
      */
     @Nullable
     public String getUniqueConstraintViolationPattern() {