(svn r10042) -Codechange: Replace hardcoded spritecache size with a configuration

option, sprite_cache_size. The default size is 2MB and the value can 
range from 1 to 64MB. If you experience slow-downs when scrolling the 
map, try increasing this setting.

src/settings.cpp

@@ -46,6 +46,7 @@
 #include "gfx.h"
 #include "fontcache.h"
 #endif
+#include "spritecache.h"
 
 /** The patch values that are used for new games and/or modified in config file */
 Patches _patches_newgame;
@@ -1257,6 +1258,7 @@ static const SettingDescGlobVarList _misc_settings[] = {
 	  SDTG_VAR("medium_size",      SLE_UINT, S, 0, _freetype.medium_size, 10, 0, 72, 0, STR_NULL, NULL),
 	  SDTG_VAR("large_size",       SLE_UINT, S, 0, _freetype.large_size,  16, 0, 72, 0, STR_NULL, NULL),
 #endif
+	  SDTG_VAR("sprite_cache_size",SLE_UINT, S, 0, _sprite_cache_size,     2, 1, 64, 0, STR_NULL, NULL),
 	  SDTG_END()
 };