Change MAX_CACHED_SCRIPTS to prevent loading classes and out of memory error for PermGen Space

In svg files with many event handler scripts are compiled if their count exceeds 32 (MAX_CAHCE_SCRIPTS=32). So additional classes org.mozzila.javascript.gen.c<XXX> will be loaded and during long term application execution repeat of events cause PermGen Space to grow and finally OOME stops execution of app.