vis-lua: introduce light references for short lived objects

Light object references are used to type check, but contrary
to full object references they are not stored in the Lua
registry.

This means that they are not bound to the object lifetime of
their corresponding C object. Hence such objects must not
be used after they have been free(3)-ed by the editor core.

Such lightweight object references are always re-created,
thus custom properties will not be stored across subsequent
accesses.

For now light object references are only used for cursor objects.

This should ix the crashes introduced by the recent changes
which make heavy use of the Lua API.

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