Simplify the asset management workflow #1259

[rohitkulkarni97]

Summary

Simplifies asset management and makes it robust by using GUIDs instead of names for referencing. Step 1 to introduce the Addressables system.

PR checklist

• The game builds properly without errors.

• No unrelated changes are present.

• No "trash" files are committed.

• Relevant code is documented.

• Update the related GitBook document, or create a new one if needed.

Pictures/Videos

Testing

Networking checklist

• Works from host in host mode.

• Works from server in server mode.

• Works on server in client mode.

• Works and is syncronized across different clients.

• Is persistent.

Changes

1. DatabaseAsset is removed instead, const strings are used in different asset database scripts, which now contain the GUID of the prefab instead of the name.
2. WorldObjectAssetReference is now named as ObjectAssetReference, because it serves more than the one purpose it was designed for.
3. RoleData and RoleLoadout use ObjectAssetReference instead of direct prefabs.
4. ObjectAssetReference now stores the GUID of the preab and the GUID of the database instead of their names.
5. GenericObjectSo uses ObjectAssetReference instead of prefabs directly.
6. Scripts using a list of audio clips to play via the audio subsystem use ObjectAssetReference instead, as the audio subsystem loads the clip from Assets.Get() anyway.

Related issues/PRs

Closes #1259
Simplify the asset management workflow