typefind: Add ability to check for EOS.
Adds gst_type_find_is_eos () and gst_type_find_helper_for_data_full () to allow type finding to hold off on suggestions until the last moment.
Adds gst_type_find_is_eos () and gst_type_find_helper_for_data_full () to allow type finding to hold off on suggestions until the last moment.