Revert "Revert PartyNames-changes on develop-branch."

This reverts commit 43545ac47f.

Conflicts:
	VocaluxeLib/Menu/CNameSelection.cs

Output/PartyModes/Challenge/Textures/Skin.xml

@@ -148,8 +148,11 @@
     <ScrollUp>ScrollUp.png</ScrollUp>
     <ScrollDown>ScrollDown.png</ScrollDown>
     <Invisible>Invisible.png</Invisible>
+    <PlayerSelector>PlayerSelector.png</PlayerSelector>
+    <Plus>Plus.png</Plus>
+    <Minus>Minus.png</Minus>
   </Skins>
   <Videos>
     <BG_Video>[Blue]BG_Video.mp4</BG_Video>
   </Videos>
-</root>
+</root>