sdbusplus: size/ssize types and 'object_path' type.

[Patrick Williams]

Hello,

For the sdbus++ interface YAML files we use in phosphor-dbus-interfaces,
I recently added support for 'size' and 'ssize' types[1].  I did this
because I've seen many cases where there was some discussion on
appropriate integer sizes for countable items (ex. uint8 vs uint32 vs
uint64).  Generally, in C++ we recommend size_t/ssize_t as the most
appropriate type for countable items (and anything else is likely a
premature optimization).  We should now take this same approach in PDI
interfaces.

Another minor change[2] is I added 'object_path' as a type alias to what
was previously just 'path'.  The name 'object_path' is what the DBus
specification calls this type, so I think that name is more obvious for
sdbus++ to also use.  Both 'path' and 'object_path' currently resolve to
the same type, but I'll probably also start switching PDI interfaces
over to the longer 'object_path' type name.

1. https://github.com/openbmc/sdbusplus/commit/4ac7e56e8e18202fad3b2734346c6d4c7a6957fc
2. https://github.com/openbmc/sdbusplus/commit/d5ce346c434705180d0cbe25686d51630681ba4b

-- 
Patrick Williams
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