Create Obfuscator struct

[rentziass]

Instead of having just the Obfuscate func, it would be nice it was a method of an Obfuscator, changing it to

type Obfuscator struct {
  Targets []*Target
  Logger Logger
}
func (o *Obfuscator) Run (r io.Reader, writer io.Writer) error

That would allow us to also get rid of Log package level variable, which is a bad bad pattern.

[m1ome]

I am on it, if you don't mind