SpeechPackBindings constructor Null safety

1. irte_engine
2. speech_pack_bindings
3. SpeechPackBindings
4. SpeechPackBindings constructor

SpeechPackBindings class

1. Constructors
2. SpeechPackBindings
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. dependencies
8. noSuchMethod
9. toString
10. Operators
11. operator ==