* Add buffer protocol

* Modify for some review comments

* Per-object buffer availability

* Rename to MemoryView from Buffer and make compilable

* Support integral repeat count in memory view format

* Support 'x' for padding bytes

* Add rb_memory_view_parse_item_format

* Check type in rb_memory_view_register

* Update dependencies in common.mk

* Add test of MemoryView

* Add test of rb_memory_view_init_as_byte_array

* Add native size format test

* Add MemoryView test utilities

* Add test of rb_memory_view_fill_contiguous_strides

* Skip spaces in format string

* Support endianness specifiers

* Update documentation

* Support alignment

* Use RUBY_ALIGNOF

* Fix format parser to follow the pack format

* Support the _ modifier

* Parse count specifiers in get_format_size function.

* Use STRUCT_ALIGNOF

* Fix test

* Fix test

* Fix total size for the case with tail padding

* Fix rb_memory_view_get_item_pointer

* Fix rb_memory_view_parse_item_format again