ShadowIRC does not currently use the global find scrap, like
Cocoa apps do. I think we should.
the find scrap can be accessed with:
OSStatus err = noErr;
ScrapRef scrap = NULL;
err = GetScrapByName(kScrapFindScrap, /*flag*/, &scrap);
the find scrap is used to store the query string that was entered
in the Find dialog or Search field.