Feature #5238: Add scale support for building elements

[iManGaaX]

Summary

Adds new element-level functions setElementScale/getElementScale that work on both objects and buildings, and deprecates setObjectScale/getObjectScale functions

Buildings are now scalable: the server stores the scale, syncs it to the client, and the client applies it to the building's RenderWare frame
Building also gets the getScale/setScale OOP methods, matching the object class

Closes #5238.

Motivation

Buildings had no way to be scaled, and setObjectScale only accepted objects. rather than changing the old function's behaviour, this introduces a clear, general replacement and follows the standard deprecation path used elsewhere in MTA

Test plan

• Start a resource that calls setObjectScale/getObjectScale and confirm the deprecation warning is logged in the server console
• setElementScale on an object: verify it behaves exactly as setObjectScale did (uniform, per-axis, and Vector3 forms, plus getElementScale round-trip)
• setElementScale on a building: verify the building is visually scaled, the value survives a reposition/recreate, and getElementScale returns it

Checklist

• Your code should follow the coding guidelines.
• Smaller pull requests are easier to review. If your pull request is beefy, your pull request should be reviewable commit-by-commit.