Add surface_index and force_index

[ILLISIS]

Hello

Requesting entity.surface_index and entity.force_index to be added instead of localizing entity.surface.index etc all the time.

Klonan was part of the discord discussion and originally had this idea.
https://discord.com/channels/1396775903 ... 8678309939

thanks!

[Klonan]

I have added it for the next release,

It results in a nice potential performance gain:

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