Fixes for engine SpawnNextToOrDrop changes

[SnappingOpossum]

About the PR

Made for RobustToolbox#37, shouldn't break anything even without it.

Why / Balance

Engine change would break stuff without this.

Technical details

Made Metamorf not DropNextTo after the SpawnNextToOrDrop, which led to removing the SharedTransformSystem dependency, and removed an unused out var. Rest is really simple stuff.

Link to space-wizards Pull Request

space-wizards URL: space-wizards/space-station-14#44204

Test plan

Make an item from a chemical reaction (like soap).

• If you're testing with the engine changes, you can also check the crystal reaction.

Butcher something with a meat spike.
Make a burger.

Media

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have tested this pull request and written instructions on how to test it
• I have added media to this PR or it does not require an in-game showcase.

Breaking changes

Changelog