implement optional byref parameter passing to function

[JoeCool]

Currently passing optional parameters is by value only...

I will love to have optional byref parameter passing

With the current syntax there is some problems tho

ex. the last parameter could be byref and optional

func blah( $x, byref $a, byref $b = 0)
...
endfunc

Passing no value is not more difficult than before, I guess ...
Passing something byref is just passing a pointer(of some sort on the stack)....
(we need to deal with initiazation to something not 0)

Better solution maybe will be to have a optional specifier ...

func blah( $x, byref $a, opt byref $b , opt $c = 22 )
...
endfunc

because initializing byref var (a pointer) to something can be dangerous ...
func blah( $x, byref $a, byref $b = 0x6666)
;not good
endfunc

what do you thing .... it can be pretty useful I think

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