Add public accessor for key config

[Richard Parsons]

It would be nice to have a public accessor for the _keyConfig variable so that keybinding could be changed at runtime. Similar to the following:

    [HideInInspector]
    public QuantumKeyConfig KeyConfig {  get { return _keyConfig; } set { _keyConfig = value; } }

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[Yusuf Ismail]

This is now supported in V2.6.0