Adde missing styles to Zenburn theme for PowerShell

Close #5161

PowerEditor/installer/themes/Zenburn.xml

@@ -613,6 +613,10 @@ License:             Feel free to modify this style and re-release it. This styl
             <WordsStyle name="INSTRUCTION WORD" styleID="8" fgColor="DFC47D" bgColor="3F3F3F" fontName="" fontStyle="1" fontSize="" keywordClass="instre1" />
             <WordsStyle name="CMDLET" styleID="9" fgColor="FFCFAF" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" keywordClass="instre2" />
             <WordsStyle name="ALIAS" styleID="10" fgColor="CEDF99" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" keywordClass="type1" />
+            <WordsStyle name="HERE STRING" styleID="14" fgColor="CC9393" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="HERE CHARACTER" styleID="15" fgColor="CC9393" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="COMMENT STREAM" styleID="13" fgColor="7F9F7F" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" />
+            <WordsStyle name="COMMENT DOC KEYWORD" styleID="16" fgColor="7F9F7F" bgColor="3F3F3F" fontName="" fontStyle="1" fontSize="" keywordClass="type4" />
         </LexerType>
         <LexerType name="props" desc="Properties file" ext="">
             <WordsStyle name="DEFAULT" styleID="0" fgColor="DCDCCC" bgColor="3F3F3F" fontName="" fontStyle="0" fontSize="" />