Updated protocol to 1500010 (Vita 2.10/2.11)
Added PTP_OC_VITA_GetVitaCapabilityInfo and PTP_OC_VITA_SendPCCapabilityInfo
Changed some pointers to double pointers to be more consistent
settings_info_from_xml() better noted to be dynamically allocated, added corresponding free_settings_info()
capability_info_from_xml(), capability_info_to_xml(), and free_capability_info() placeholders added (no point coding them now since the Vita doesn't use the data)