[jdk13] Added support for printing text blocks (triple quoted strings) in text block form

test/pretty/resource/before/TextBlocks.java

@@ -0,0 +1,24 @@
+// version 13:
+public class TextBlocks {
+	private String example = """
+		This should not be indented.\nline 2
+		line 3
+		""";
+	
+	private String ex2 = """
+		This should be though.
+	""";
+	
+	private String ex3 = "This is a simple\nstring";
+	
+	private String ex4 = """   
+		""";
+	
+	private String bizarroDent = """
+		  foo\n    bar""" + "hey" + """
+			weird!""";
+	
+	private String stringFolding = "hmmm" + """
+		line1
+			line2""";
+}