Refactor lib/open to accept user provided arguments

* Get rid of open_darwin
	It just lead to code duplication for a simple one string change.
	Instead we query it during initialization
* Accept user provided arguments
	"open" on MacOS accepts things like -A to use a specific application
	Pass trough arguments the user provided in order to facilitate this
* Refactor the function to a struct
	This makes it more convenient for the caller and avoids signatures like
	lib.OpenFile(nil, u.String(), nil) which are fairly unreadable

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