ocarina: Filter the library

I call the new libsaria.sources.filter() function and test ids using
libsaria.sources.is_visible().

ocarina/library.py

@@ -23,6 +23,16 @@ def refresh():
 	lib_page.clear()
 	fill_library()
 
+def do_refilter(list, iter):
+	return libsaria.sources.is_visible(list[iter][0])
+lib_page.set_filter_func(do_refilter)
+
+def filter(text):
+	library.filter(text)
+	lib_page.refilter()
+	set_label_text()
+LIB_PAGE.filter = filter
+
 import playlist
 import queue