feat: allow reloading multiple solids

[shmakota]

Purpose of change (The Why)

We now have the ability to reload containers, but only one at a time. However the engine supports multiple items in one container.

Describe the solution (The How)

Allow reloading multiple items into one container.

Also adds the ability to select a specific item to unload from a container with multiple items.

Describe alternatives you've considered

Testing

Spawned a cardboard box and a variety of items, reloaded it.

Additional context

Checklist

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[autofix-ci]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

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[chaosvolt]

Speedloaders keep having a test failure it seems.