utilise other equippable write methods on parts

[Yuripetusko]

Is your feature request related to a problem? Please describe.
Currently there is no way to add one more equippable collection to part without re-setting the whole array.

Describe the solution you'd like
Instead of using setEquippables like now, utilise addEquippable and resetEquippable methods. Perhaps when it's time to save, we can iterate through all current equippables and see if they are still in the new array. If they are, then use add, if not then use set. Also add a button to reset equippable array on the part (onchain)

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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