Trying to use UR multi-line quotes more often to be consistent about UTF-32.

Source/test/tests/TextEncodingTest.cpp

@@ -4,7 +4,7 @@
 // These tests will fail if the source code document or stored files change their encoding of line breaks.
 
 String expected_latin1 =
-R"QUOTE(Hello my friend
+UR"QUOTE(Hello my friend
 Hej min vän
 Halló, vinur minn
 Hei ystäväni