Add "null statements" to the compiler

[wixoaGit]

Just a lone semicolon that represents a statement with nothing in it. Allows for suppressing EmptyBlock emissions.

/proc/main()
    if (TRUE) // Has no body, considered an empty block.

/proc/main()
    if (TRUE)
        ; // A null statement. Not considered an empty block.

[ZeWaka]

Thanks! Sorry for not getting to this.