Ported blender-cnt from Blender 2.7 to 2.8

[mpseligson]

• Object.dupli_type was deprecated, using Object.instance_type instead
• properties are now initialized with ':' operator instead of '=', so changed property declaration for different bpy.props objects
• Changed bl_info dictionary to include '"blender" : (2, 80, 0)' which explicitly declares 2.8 compatibility