made improvements to legacy text effect

effects/internal/richtexteffect.cpp

@@ -0,0 +1,20 @@
+#include "richtexteffect.h"
+
+RichTextEffect::RichTextEffect(Clip *c, const EffectMeta *em)
+{
+
+}
+
+void RichTextEffect::redraw(double timecode)
+{
+  QPainter p(&img);
+  p.setRenderHint(QPainter::Antialiasing);
+  int width = img.width();
+  int height = img.height();
+
+  img.fill(Qt::transparent);
+
+  QTextDocument td;
+  td.setHtml(text_val->GetStringAt(timecode));
+  td.drawContents(&p);
+}