tweak(core/sbag): delete state bags that get passed as nil

[AvarianKnight]

Goal of this PR

Delete state bags that have their value gets set to nil.

This will still send the value getting set to nil/null for the client so it will still hit ADD_STATE_BAG_CHANGE_HANDLER and be able to clean up previous state, but it wont be called again on scope enter/leave so it wont lead to unexpected/undesired behavior.

Getting values default to nil/null so this shouldn't break compatibility with GET_STATE_BAG_VALUE.

How is this PR achieving the goal

Check for 0xc0 and if the first byte is it, remove it from the state bag map

This PR applies to the following area(s)

Server

Successfully tested on

Game builds: b3095

Platforms: Windows

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

[FabianTerhorst]

Thanks for the contribution. Tested and works well. 👍