* src/keymap.c: fix KP_PageDown in application keypad mode (#113187).
* src/reaper.c: add a finalize method which properly cleans things up so that
	the singleton can at least theoretically be destroyed (part of a fix
	for #112172).
* src/vte.c: obtain a ref to a reaper object whenever we are waiting for a
	child to exit.
* po/POTFILES.in: add more source files for scanning.
* src/iso2022.c: rework pieces to handle incomplete sequences at the end of
	input.  Check for 8-bit SS2 and SS3 in case of EILSEQ.  Build a fake
	ISO-8859-1 map for conversions using invalid maps.
* src/iso2022.c(_vte_iso2022_state_free): free the state's buffer.
* src/vteconv.c: internalize UTF-8 to UTF-8 conversions, fix handling of
	incomplete sequences at the end of the available data.
* src/vte.c: implement send/receive and automatic linefeed modes.
* src/vte.c(vte_sequence_handler_sr): invalidate the row which contains the
	cursor to ensure that it doesn't leave a trail.
* src/vte.c(vte_sequence_handler_return_terminal_id): add.
* src/vte.c(vte_terminal_feed_child_using_modes): add.