Assembler method definition format

[ForNeVeR]

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We (I and @gsomix) have came to conclusion that it'll be better to use the following format for the method definitions in Naggum.Assembler:

 (.method (name arguments returnType ?metadata) &body)

So we could turn the metadata to an optional argument. @gsomix said that it reminds him Scheme procedure definition syntax.

[ForNeVeR]

Maybe syntax for the call instruction should be also changed to mirror the definition syntax. Consider something like the following:

(call (mscorlib System.Console (WriteLine (System.Int32) System.Void)))

i.e. (call (<assembly> <type> (<method> <arguments> <returnType>))).