Update AbstractElement.php - fgColor and bgColor

In combination with next edit...

Sets the fgColor and bgColor according to the colorTable.

Author: rasamassen

src/PhpWord/Writer/RTF/Element/AbstractElement.php

@@ -200,6 +200,18 @@ protected function writeFontStyle()
                 $styleWriter->setColorIndex($colorIndex + 1);
             }
         }
+        if ($this->fontStyle->getFgColor() != null) {
+            $colorIndex = array_search($this->fontStyle->getFgColor(), $parentWriter->getColorTable());
+            if ($colorIndex !== false) {
+                $styleWriter->setFgColorIndex($colorIndex + 1);
+            }
+        }
+        if ($this->fontStyle->getBgColor() != null) {
+            $colorIndex = array_search($this->fontStyle->getBgColor(), $parentWriter->getColorTable());
+            if ($colorIndex !== false) {
+                $styleWriter->setBgColorIndex($colorIndex + 1);
+            }
+        }
         if ($this->fontStyle->getName() != null) {
             $fontIndex = array_search($this->fontStyle->getName(), $parentWriter->getFontTable());
             if ($fontIndex !== false) {