Reading spidertron settings from LuaItemStack

[Kraskaska]

I would like to have APIs to read spidertron settings from LuaItemStack.
To be more exact, i need:

• Logistic settings: if it's enabled, if it's enabled while moving, if buffer requests are allowed, logistic requests
• Targeting information (with/without gunner)

[Bilka]

Added LuaItemCommon::entity_logistic_sections and entity_request_from_buffers read/write for 2.0.67.

Also, added LuaItemCommon::entity_logistics_enabled, entity_enable_logistics_while_moving, entity_driver_is_gunner, entity_auto_target_without_gunner and entity_auto_target_with_gunner for 2.0.69.