One time pixmap cache update

Code will now perform a one time check on starting to see if the cache
has been updated to the new 2048 default. If the update has not been set
we update. After this time if the user lowers the level, it will not
reset back to 2048 by default.

cockatrice/src/settingscache.cpp

@@ -23,7 +23,16 @@ SettingsCache::SettingsCache()
 
     picDownload = settings->value("personal/picturedownload", true).toBool();
     picDownloadHq = settings->value("personal/picturedownloadhq", true).toBool();
-    pixmapCacheSize = settings->value("personal/pixmapCacheSize", PIXMAPCACHE_SIZE_DEFAULT).toInt();
+    
+    // we only want to reset the cache once, then its up to the user
+    bool updateCache = settings->value("update/pixmapCacheSize", false).toBool();
+    if (!updateCache) {
+        pixmapCacheSize = PIXMAPCACHE_SIZE_DEFAULT;
+        settings->setValue("personal/pixmapCacheSize", pixmapCacheSize);
+        settings->setValue("update/pixmapCacheSize", true);
+    }
+    else
+        pixmapCacheSize = settings->value("personal/pixmapCacheSize", PIXMAPCACHE_SIZE_DEFAULT).toInt();
     //sanity check
     if(pixmapCacheSize < PIXMAPCACHE_SIZE_MIN || pixmapCacheSize > PIXMAPCACHE_SIZE_MAX)
         pixmapCacheSize = PIXMAPCACHE_SIZE_DEFAULT;