Add: option to enable KaraokeEffect with gestreamer backend (atm only for all audio globally)

Output/Themes/Ambient/Screens/ScreenOptionsSound.xml

@@ -110,6 +110,20 @@
       <Style>Bold</Style>
       <Font>Outline</Font>
       <Text>TR_SCREENOSOUND_GAMEMUSICVOLUME</Text>
+    </Text>
+	<Text Name="Text7">
+      <X>75</X>
+      <Y>407</Y>
+      <Z>0</Z>
+      <H>27</H>
+      <MaxW>0</MaxW>
+      <Color Name="StaticColor" />
+      <SelColor Name="TextSelColor" />
+      <Align>Left</Align>
+      <ResizeAlign>Center</ResizeAlign>
+      <Style>Bold</Style>
+      <Font>Outline</Font>
+      <Text>TR_SCREENOSOUND_KARAOKEEFFECT</Text>
     </Text>
   </Texts>
   <Buttons>
@@ -361,6 +375,48 @@
       <TextFont>Outline</TextFont>
       <TextStyle>Bold</TextStyle>
       <NumVisible>3</NumVisible>
+    </SelectSlide>
+	<SelectSlide Name="SelectSlideKaraokeEffect">
+      <Skin/>
+      <SkinArrowLeft>SelectSlideArrowLeft</SkinArrowLeft>
+      <SkinArrowRight>SelectSlideArrowRight</SkinArrowRight>
+      <SkinSelected>SelectSlide</SkinSelected>
+      <SkinArrowLeftSelected>SelectSlideArrowLeft</SkinArrowLeftSelected>
+      <SkinArrowRightSelected>SelectSlideArrowRight</SkinArrowRightSelected>
+      <Rect>
+        <X>500</X>
+        <Y>400</Y>
+        <W>700</W>
+        <H>50</H>
+        <Z>0</Z>
+      </Rect>
+      <RectArrowLeft>
+        <X>505</X>
+        <Y>405</Y>
+        <W>40</W>
+        <H>40</H>
+        <Z>0</Z>
+      </RectArrowLeft>
+      <RectArrowRight>
+        <X>1170</X>
+        <Y>405</Y>
+        <W>40</W>
+        <H>40</H>
+        <Z>0</Z>
+      </RectArrowRight>
+      <Color Name="SelectSlideColor" />
+      <SelColor Name="SelectSlideSelColor" />
+      <ArrowColor Name="ArrowColor" />
+      <ArrowSelColor Name="ArrowSelColor" />
+      <TextColor Name="TextColor" />
+      <TextSelColor Name="TextSelColor" />
+      <TextH>27</TextH>
+      <TextRelativeX>50</TextRelativeX>
+      <TextRelativeY>0</TextRelativeY>
+      <TextMaxW>500</TextMaxW>
+      <TextFont>Outline</TextFont>
+      <TextStyle>Bold</TextStyle>
+      <NumVisible>2</NumVisible>
     </SelectSlide>
   </SelectSlides>
   <SingNotes />