v3.0.0: added support for using '**' to highlight, like in markdown

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ui/RenderedTextBlock.java

@@ -116,8 +116,10 @@ public class RenderedTextBlock extends Component {
 		words = new ArrayList<>();
 		boolean highlighting = false;
 		for (String str : tokens){
-			
-			if (str.equals("_") && highlightingEnabled){
+
+			//if highlighting is enabled, '_' or '**' is used to toggle highlighting on or off
+			// the actual symbols are not rendered
+			if ((str.equals("_") || str.equals("**")) && highlightingEnabled){
 				highlighting = !highlighting;
 			} else if (str.equals("\n")){
 				words.add(NEWLINE);