libnm: fix NMIP4Config/NMIP6Config addresses/routes properties
The docs for NMIP4Config:addresses and NMIP4Config:routes claimed that they were GPtrArrays of NMIP4Address/NMIP4Route, but get_property() was actually trying to set them the D-Bus representation type, and it was failing anyway because it used g_value_set_boxed() on a parameter that was declared GParamSpecPointer. Fix it to use a GPtrArray-valued property, and set it to the right thing. NMIP6Config did the right thing with its :addresses and :routes properties, but was using custom types (NM_TYPE_IP6_ADDRESS_OBJECT_ARRAY and NM_TYPE_IP6_ROUTE_OBJECT_ARRAY). Make it use G_TYPE_PTR_ARRAY instead. nm-types.c, nm-types.h, and nm-types-private.h are now empty, and so can be dropped.
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