SCI: Refactor relocation code

This groundwork enables an object to look up its static name
separately from the normal process that is used to populate
Object::_variables when an object is first constructed.

(The static name property needs to be able to be retrieved from
objects inside of earlier save games whose name properties may
have already been modified at runtime, so the code cannot simply
pluck the value out of Object::_variables when they are first
initialised and then persisted into the save game, as nice and
easy as that would have been.)

This commit also helps to clarify the situation with relocation
tables in SCI1 games that start with a zero entry.

Refs Trac#9780.

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