Improve challenge party mode (#911)

- Instead of a number of rounds, you now choose how many songs each player sings
- New option to remember sung songs, so a new challenge doesn't repeat songs from the previous ones
- Up to 16 players
- The number of jokers and the joker refill setting are kept instead of being reset every time
- The overview shows each player's avatar, the top three in gold, silver and bronze and highlights the leader
- The winner of each round is highlighted in the round list
- The winner is celebrated at the end with avatar, a pulsing gold name and stars

Co-authored-by: Florian Ostertag <flokuep@users.noreply.github.com>

Output/PartyModes/Challenge/Themes/Default/Screens/PartyScreenChallengeConfig.xml

@@ -2,7 +2,7 @@
 <Screen>
   <Informations>
     <ScreenName>PartyScreenChallengeConfig</ScreenName>
-    <ScreenVersion>3</ScreenVersion>
+    <ScreenVersion>4</ScreenVersion>
   </Informations>
   <Backgrounds>
     <Background Name="Background1">
@@ -81,7 +81,7 @@
       <ResizeAlign>Center</ResizeAlign>
       <Style>Bold</Style>
       <Font>Outline</Font>
-      <Text>TR_SCREENCONFIG_NUMROUNDS</Text>
+      <Text>TR_SCREENCONFIG_SONGSPERPLAYER</Text>
     </Text>
 	<Text Name="TextNumJokers">
       <X>112.5</X>
@@ -111,6 +111,20 @@
       <Font>Outline</Font>
       <Text>TR_SCREENCONFIG_REFILLJOKERS</Text>
     </Text>
+    <Text Name="TextRememberSongs">
+      <X>112.5</X>
+      <Y>607.5</Y>
+      <Z>0</Z>
+      <H>40.5</H>
+      <MaxW>0</MaxW>
+      <Color Name="TextColor" />
+      <SelColor Name="TextSelColor" />
+      <Align>Left</Align>
+      <ResizeAlign>Center</ResizeAlign>
+      <Style>Bold</Style>
+      <Font>Outline</Font>
+      <Text>TR_SCREENCONFIG_REMEMBERSONGS</Text>
+    </Text>
   </Texts>
   <Buttons>
     <Button Name="ButtonNext">
@@ -271,7 +285,7 @@
       <TextStyle>Bold</TextStyle>
       <NumVisible>2</NumVisible>
     </SelectSlide>
-    <SelectSlide Name="SelectSlideNumRounds">
+    <SelectSlide Name="SelectSlideSongsPerPlayer">
       <Skin />
       <SkinArrowLeft>SelectSlideArrowLeft</SkinArrowLeft>
       <SkinArrowRight>SelectSlideArrowRight</SkinArrowRight>
@@ -397,6 +411,48 @@
       <TextStyle>Bold</TextStyle>
       <NumVisible>2</NumVisible>
     </SelectSlide>
+    <SelectSlide Name="SelectSlideRememberSongs">
+      <Skin />
+      <SkinArrowLeft>SelectSlideArrowLeft</SkinArrowLeft>
+      <SkinArrowRight>SelectSlideArrowRight</SkinArrowRight>
+      <SkinSelected>SelectSlide</SkinSelected>
+      <SkinArrowLeftSelected>SelectSlideArrowLeft</SkinArrowLeftSelected>
+      <SkinArrowRightSelected>SelectSlideArrowRight</SkinArrowRightSelected>
+      <Rect>
+        <X>750</X>
+        <Y>600</Y>
+        <W>1050</W>
+        <H>75</H>
+        <Z>0</Z>
+      </Rect>
+      <RectArrowLeft>
+        <X>757.5</X>
+        <Y>607.5</Y>
+        <W>60</W>
+        <H>60</H>
+        <Z>0</Z>
+      </RectArrowLeft>
+      <RectArrowRight>
+        <X>1732.5</X>
+        <Y>607.5</Y>
+        <W>60</W>
+        <H>60</H>
+        <Z>0</Z>
+      </RectArrowRight>
+      <Color Name="SelectSlideColor" />
+      <SelColor Name="SelectSlideSelColor" />
+      <ArrowColor Name="ArrowColor" />
+      <ArrowSelColor Name="ArrowSelColor" />
+      <TextColor Name="TextColorAlpha" />
+      <TextSelColor Name="TextSelColor" />
+      <TextH>40.5</TextH>
+      <TextRelativeX>75</TextRelativeX>
+      <TextRelativeY>0</TextRelativeY>
+      <TextMaxW>300</TextMaxW>
+      <TextFont>Outline</TextFont>
+      <TextStyle>Bold</TextStyle>
+      <NumVisible>2</NumVisible>
+    </SelectSlide>
   </SelectSlides>
   <SingNotes />
   <NameSelections />