Fixed bug that prevented Asset Viewer from using shader, manifests are now sorted by name, fixed sponza test model manifest

lib/tools/asset_viewer/lib/main_menu.rb

@@ -16,6 +16,8 @@ class IMICFPS
           end
         end
 
+        @manifests.sort_by! { |m| m.name.downcase }
+
         flow(margin: 10) do
           @manifests.each do |manifest|
             button manifest.name do

lib/tools/asset_viewer/lib/turn_table.rb

@@ -8,7 +8,7 @@ class IMICFPS
         window.needs_cursor = false
         @manifest = @options[:manifest]
 
-        if window.config.get(:debug, :use_shaders)
+        if window.config.get(:debug_options, :use_shaders) && !Shader.available?("default")
           Shader.new(
             name: "default",
             includes_dir: "shaders/include",