[implemented] A function for CPU architecture

[votan]

A function to let us know, if we are running 32bit or 64bit client.
For example for the Lua memory limit.
And not every user knows how to verify which client is running, if the launcher starts it.

If such a function already exists, I did not find it.

Maybe one could extend the GetUIPlatform function like this:
local platform, architecture = GetUIPlatform()

UI_PLATFORM_ARCHITECTURE_X86
UI_PLATFORM_ARCHITECTURE_X64

Thanks in advance