Keep refnum when moving objects to/from inventory (partially resolves #6148)

Petr Mikheevrequested to merge
ptmikheev/openmw:keep_refnum into master

Changes:

  • Picking up an item preserves RefNum and Lua scripts if the item is not stacked. It means that references to the item in Lua scripts remain valid.
  • Dropping an item from inventory to the world via Lua (obj:teleport) preserves RefNum and Lua scripts.
    Note: Dropping an item via GUI still creates a copy and generates a new RefNum. I didn't change it yet, because I afraid to break something.
  • Fixed a bug that after copying an object (e.g. by dropping to the ground) the new object was linked to the Lua scripts of the old object.
Edited by Petr Mikheev

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