Optimize interpreter with computed gotos

[mateofio]

This is a non standard language feature implemented on all compilers except Microsoft.

• Merge all 3 ExecuteCommand methods into 1
• Reimplement the switch using computed goto and measure the performance gain.
• Provide a fallback for MSVC

https://youtu.be/IAdLwUXRUvg
Around the 41 minute mark

The speaker claims a 10-20% speed in improvement in Lua and Python interpreters using this technique.

This could result in 10-40% speedup in Player interpreter execution. It may be especially meaningful in resource constrained platforms.