Fixed GAMESTATE:GetCurrentStage to use correct logic for determining if all human players are on final stage.

THEME:GetPath lua functions can now pass true for the third arg if the element is optional.
Fixes to various StageDisplay things in default.
thify_number and thified_curstage_index lua functions added to default/Scripts/04 Other.lua.

Themes/default/Graphics/ScreenEvaluationSummary BannerList.lua

@@ -33,7 +33,7 @@ for i=1,#statList do
 	as[#as+1] = Def.ActorFrame {
 		Def.Sprite {
 			InitCommand=cmd(scaletoclipped,256,80);
-			BeginCommand=function(self)
+			OnCommand=function(self)
 				local path = statList[j]:GetPlayedSongs()[1]:GetBannerPath() or THEME:GetPathG("Common","fallback banner");
 				self:LoadBanner(path);
 			end;
@@ -43,7 +43,7 @@ for i=1,#statList do
 			OnCommand=cmd(zoomto,80,18;diffuse,Color.Black;diffusealpha,0.5;fadeleft,0.5);
 		};
 		LoadFont("Common Normal") .. {
-			Text=StageToLocalizedString( statList[j]:GetStage() );
+			Text=thify_number(statList[j]:GetStageIndex()+1);
 			InitCommand=cmd(x,128-4;y,40-4;horizalign,right;vertalign,bottom);
 			OnCommand=cmd(diffuse,StageToColor(statList[j]:GetStage());zoom,0.675;shadowlength,1);
 		};