[TD]handle escaped unicode annotation text

- v0.19 (and earlier?) stored annotation text as escaped unicode, but
  v0.20 stores the text as utf8.
- checks for "\x" in text to determine is text is escaped or utf8

src/Mod/TechDraw/Gui/QGIViewAnnotation.cpp

@@ -39,6 +39,7 @@
 
 #include <App/Application.h>
 #include <Base/Console.h>
+#include <Base/Tools.h>
 #include <Gui/MainWindow.h>
 #include <Gui/Widgets.h>
 #include <Mod/TechDraw/App/DrawViewAnnotation.h>
@@ -111,7 +112,21 @@ void QGIViewAnnotation::drawAnnotation()
         return;
     }
 
-    const std::vector<std::string>& annoText = viewAnno->Text.getValues();
+    const std::vector<std::string>& annoRawText = viewAnno->Text.getValues();
+    std::vector<std::string> annoText;
+    // v0.19- stored text as escapedUnicode
+    // v0.20+ stores text as utf8
+    for (auto& line : annoRawText) {
+        if (line.find("\\x") == std::string::npos) {
+            // not escaped
+            annoText.push_back(line);
+        } else {
+            // is escaped
+            std::string newLine = Base::Tools::escapedUnicodeToUtf8(line);
+            annoText.push_back(newLine);
+        }
+    }
+
     int scaledSize = exactFontSize(viewAnno->Font.getValue(), viewAnno->TextSize.getValue());
 
     //build HTML/CSS formatting around Text lines