CI improvements, fix plugin unloading crash · Mooshua/BitMod@3153c17

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

One of '--self-contained' or '--no-self-contained' options are required when '--runtime' is used.

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

One of '--self-contained' or '--no-self-contained' options are required when '--runtime' is used.

Type parameter 'TPlayer' has the same name as the type parameter from outer type 'GameServer<TPlayer>'

'Attachment' defines operator == or operator != but does not override Object.Equals(object o)

'Attachment' defines operator == or operator != but does not override Object.GetHashCode()

'Gadget' defines operator == or operator != but does not override Object.Equals(object o)

'Gadget' defines operator == or operator != but does not override Object.GetHashCode()

'Map' defines operator == or operator != but does not override Object.Equals(object o)

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