Support source_location_not_in and source_location_not_regexp suppressions

Support source_location_not_in and source_location_not_regexp suppressions

This patch adds support for properties source_location_not_in and
source_location_not_regexp in the [suppress_type] section of
suppression specifications.  So the suppression specification:

  [suppress_type]
    source_location_not_in = foo1.h, foo2.h bar1.h bar2.h

suppresses ABI change reports about types that are *NOT* defined in
files foo{1,2}.h and bar{1,2}.h.  The intended use of this construct is to
constrain abi change reports to types that are part of the API of a
given shared library.  The API of the library is supposed to be
defined in foo.h and bar.h only.

Similarly, the suppression specification:

  [suppress_type]
    source_location_not_regexp = (foo|bar){1,2}\\.h

suppresses ABI change reports about types that are not defined in the
same set of files foo1.h, foo2.h, bar1.h and bar2.h.

	* include/abg-ini.h (enum property_value::value_kind): Add a
	LIST_PROPERTY_VALUE kind.
	(class {list_property_value, list_property}): Declare new types.
	(is_list_property, is_list_property_value): Declare new functions.
	* src/abg-ini.cc (struct list_property_value::priv): Define new
	type.
	(list_property_value::{list_property_value, get_content,
	set_content, as_string}): Define new member functions.
	(is_list_property_value): Define new function.
	(struct list_property::priv): Define new type.
	(list_property::{list_property, get_value, set_value,
	handle_escape}): Define new member functions.
	(is_list_property): Define new function.
	(read_context::buf_): New data member.
	(read_context::{peek, get, put_back, good, eof, read_string,
	read_list_property_value}): New member functions.
	(read_context::read_next_char): Use the new read_context::{get,
	good, eof} member function, rather than using the input stream
	directly.
	(read_context::{skip_white_spaces, skip_comments,
	skip_white_spaces_or_comments, read_property_name,
	read_function_name, read_function_argument,
	read_function_call_expr, read_property_value,
	read_tuple_property_value, read_section_name, read_section}):
	Adjust to use the new member functions of read_context rather than
	using the input stream directly.
	(read_context::read_string_property_value): Likewise.  Use the new
	read_context::read_string() method.
	(read_context::{read, write}_property): Support reading list_property.
	* include/abg-comparison.h
	(type_suppression::{get_source_locations_to_keep,
	set_source_locations_to_keep,
	set_source_location_to_keep_regex_str,
	get_source_location_to_keep_regex_str}): Add new member functions.
	* src/abg-comparison.cc
	(type_suppression::priv::{source_location_to_keep_,
	source_location_to_keep_regex_str_,
	source_location_to_keep_regex_}): Add new data members.
	(type_suppression::priv::{g,s}et_source_location_to_keep_regex):
	Define new member functions.
	(type_suppression::{g,s}et_source_locations_to_keep): Define new
	member functions.
	(type_suppression::{g,s}et_source_location_to_keep_regex_str):
	Likewise.
	(type_suppression::suppresses_type): Support
	"source_location_not_regexp" and "source_location_not_in"
	properties of suppression specifications.
	(read_type_suppression): Likewise. Also adjust to the fact that
	ta tuple property value that is a list of strings is not a list
	property value.
	* doc/manuals/libabigail-concepts.rst: Add documentation for
	source_location_not_in and source_location_not_regexp.
	* tests/data/test-diff-suppr/libtest26-loc-suppr-v{0,1}.so: New
	binary test inputs.
	* tests/data/test-diff-suppr/test26-loc-suppr-{0,1,2}.suppr: New
	suppression specification test inputs.
	* tests/data/test-diff-suppr/test26-loc-suppr-report-{0,1,2,3}.txt:
	New test reference reports.
	* tests/data/test-diff-suppr/test26-loc-suppr-v{0,1}.cc: Source
	code of the test binary input above.
	* tests/data/test-diff-suppr/test26-loc-suppr.h: Likewise.
	* tests/data/Makefile.am: Add the new test material to source
	distribution.
	* tests/test-diff-suppr.cc (in_out_specs): Add the new test inputs above.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>