experimental 'HighResolutionTextures' pref to control behavior of doubleres textures

stepmania/Themes/default/Languages/en.ini

@@ -335,7 +335,7 @@ LifeDifficulty=Increase this value to cause your life meter to drain faster and
 LifeType=LifeType
 Advanced Options=Change advanced options such as scoring, timing window, and life meter settings.
 MasterVolume=
-HighResolutionTextures=Choose whether high resolution textures will be loaded.  High resolution textures will only work if supported by the current theme.
+HighResolutionTextures=Choose whether high resolution textures (if supported by the current theme) will be used.  When set to Auto, high resolution textures will be used if the display height is > 480.
 MaxTextureResolution=Choose the maximum texture resolution.  Setting this to anything below 1024 will cause some textures to appear blurry, but may increase your frame rate.
 MenuTimer=When &oq;OFF&cq;, the time limit in menus is disabled.
 Mines=Mines

stepmania/src/StepMania.cpp

@@ -154,7 +154,7 @@ bool StepMania::GetHighResolutionTextures()
 	case HighResolutionTextures_Auto:
 		{
 			const VideoModeParams &params = DISPLAY->GetActualVideoModeParams();
-			return params.height > 800;
+			return params.height > 480;
 		}
 	case HighResolutionTextures_ForceOn:
 		return true;