Invoke function

The Invoke function is used to specific to MASM, and it can call functions without
having to push the parameters beforehand. This saves us a lot of typing effort.

Here is an example
invoke SendMessage, [hWnd], WM_CLOSE, 0, 0

that is interpreted as

push 0
push 0
push WM_CLOSE
push [hWnd]
call [SendMessage]

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