fix: Prevents reloading from deleting containers

[joveeater]

Purpose of change

Fixes #4068.

Describe the solution

Moves magazine reloading to the new safer stack splitting system and moves the old charges==0 check to the one branch that still uses the old stuff.

Describe alternatives you've considered

Cleaning it up further, moving that last branch to the newer stuff and sorting out whatever's going on with speedloaders is probably a good idea at some point.

Testing

The reported bug (i.e. reloading liquids), reloading magazines, reloading singles and reloading with a speedloader.

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