Initial updates to make generic containers work.

osu.Game/GameModes/Play/Osu/OsuPlayfield.cs

@@ -12,7 +12,7 @@ namespace osu.Game.GameModes.Play.Osu
 {
     public class OsuPlayfield : Playfield
     {
-        protected override Container Content => hitObjectContainer;
+        protected override Container<Drawable> Content => hitObjectContainer;
 
         private Container hitObjectContainer;
 
@@ -53,7 +53,7 @@ namespace osu.Game.GameModes.Play.Osu
 
         class HitObjectContainer : Container
         {
-            protected override Vector2 ChildScale => new Vector2(0.625f);
+            public override Vector2 ChildScale => new Vector2(0.625f);
         }
     }
 }

osu.Game/Graphics/Containers/ParallaxContainer.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Graphics.Containers
 
         private Container content;
 
-        protected override Container Content => content;
+        protected override Container<Drawable> Content => content;
 
         protected override void Load(BaseGame game)
         {

osu.Game/OsuGameBase.cs

@@ -30,7 +30,7 @@ namespace osu.Game
         public OptionsOverlay Options;
         public APIAccess API;
 
-        protected override Container Content => ratioContainer;
+        protected override Container<Drawable> Content => ratioContainer;
 
         private RatioAdjust ratioContainer;
 

osu.Game/Overlays/ChatConsole.cs

@@ -27,7 +27,7 @@ namespace osu.Game.Overlays
 
         private Container content;
 
-        protected override Container Content => content;
+        protected override Container<Drawable> Content => content;
 
         private APIAccess api;
 

osu.Game/Overlays/Options/OptionsSection.cs

@@ -11,7 +11,7 @@ namespace osu.Game.Overlays.Options
     public abstract class OptionsSection : Container
     {
         protected FlowContainer content;
-        protected override Container Content => content;
+        protected override Container<Drawable> Content => content;
 
         protected abstract string Header { get; }
 

osu.Game/Overlays/Options/OptionsSubsection.cs

@@ -9,7 +9,7 @@ namespace osu.Game.Overlays.Options
     public abstract class OptionsSubsection : Container
     {
         private Container content;
-        protected override Container Content => content;
+        protected override Container<Drawable> Content => content;
         
         protected abstract string Header { get; }