updated pom, optimized code for java 11

.gitignore

@@ -8,3 +8,4 @@ bin/
 .classpath
 .project
 export.jardesc
+**/.DS_Store

pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
         <groupId>org.bioimageanalysis.icy</groupId>
         <artifactId>pom-icy</artifactId>
-        <version>2.1.5</version>
+        <version>2.2.0</version>
     </parent>
 
     <artifactId>color-picker-threshold</artifactId>
-    <version>1.2.3</version>
-
-    <packaging>jar</packaging>
+    <version>2.0.0</version>
 
     <name>Color Picker Threshold</name>
     <description>