Updating defined phrases & removal of treaty text

Review of the definition for the phrase 'convention' listed in section 3. Also removes the requirement that the full text of the International Convention for the Protection of New Varieties of Plants (UPOV Convention) be set out in Schedule 1.

Review of the definitions for a number of phrases, to ensure they are consistent with the UPOV Convention. These definitions are for: 'authority', 'territory' and 'variety'. Schedule 1 - consequential repeal due to changes to section 3 and the removal of the requirement to set out the full text of the UPOV Convention.