support of RichTextFX to have syntax highlighting in the groovy edit field of validation editor

src/main/resources/ninja/javafx/smartcsv/fx/smartcsv.css

@@ -179,4 +179,35 @@
     -fx-text-fill: black;
     -fx-font-size: 12px;
     -fx-padding: 10 10 10 10;
+}
+
+.keyword {
+    -fx-fill: purple;
+    -fx-font-weight: bold;
+}
+.semicolon {
+    -fx-font-weight: bold;
+}
+.paren {
+    -fx-fill: firebrick;
+    -fx-font-weight: bold;
+}
+.bracket {
+    -fx-fill: darkgreen;
+    -fx-font-weight: bold;
+}
+.brace {
+    -fx-fill: teal;
+    -fx-font-weight: bold;
+}
+.string {
+    -fx-fill: blue;
+}
+
+.comment {
+    -fx-fill: cadetblue;
+}
+
+.paragraph-box:has-caret {
+    -fx-background-color: #f2f9fc;
 }