addVfx ability to provide additional local offset

MaxYarirequested to merge
MaxYari/openmw:luaaddvfxoffset into master

As per the title - adds localOffset field into options table of the method. Transformations happen in a local space of the bone.

Demo: https://discord.com/channels/260439894298460160/260443767482482688/1351202337892597891

You can test it by installing https://github.com/MaxYari/OpenMWExperimentalMods and enabling PlayerVfx.omwscripts. Should see a basket attached to player's head bone.

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