add stack buffer in vmx-root

[xmaple555]

Description

Add stack buffer in vmx-root, so now we can use user-defined functions in script-engine.

Each core runs script at one time, and two or more cores run different scripts at the same time, so each core has its own stack buffer. I follow ScriptEngineCoreSpecificTempVariable to allocate memory to ScriptEngineCoreSpecificStackBuffer.

Not really sure if I did it the right way, so it should be check.

[SinaKarvandi]

At a glance, I think you did right. Yes, each core can separately (independent from other cores) run scripts. 👍

Other than that, as a suggestion, you could also add something similar to import in Python or using in C#, and other programming languages to the script engine, so that we can start writing some functions as libraries where users can include their '.ds' libraries and reuse them in their scripts.