More bug fixes

Yet another bug fix release is here! As always, test before putting it to a public server - we might've broken something.

• Fixed growth event being triggered by other events
• Fixed some syntaxes not working in effect commands
• Fixed changes applied a bit before 1.13 being missing
• Fixed hanging events causing exceptions (#1689)
• Fixed updating item variables to new aliases - in most cases, at least (#1697)
• Fixed a bug that caused all growth events to trigger every time something grew (#1699, #865)
• Fixed the expression to get player skulls not working at all (#1715)
• Fixed a bug that caused getting enchantments from air to throw exceptions (#1732)
• Fixed some visual effects on Minecraft 1.13 (closes #1741)
• Fixed a few type conversion bugs (#1747)
• Improved money hook to tolerate Vault and economy plugin bugs better
• Fixed 'named' expression also modifying the item that was given to it
• Updated to latest Paper API