|SOURCE|
[System::InputManager]
* Added destructor
[Linux::System::Keyboard]
* Type returns the enum value rather than a member variable
* Added a stub member variable for key states
[Linux::System::LinuxInputManager]
* Preliminary implemntation and member function subbing-out
|SOURCE|
[System::InputDevice]
* Type and State member functions are const correct
[System::InputManager]
* AddDevice accepts a pointer instead of a reference for the input device as
  the base class is abstract
[System::Keyboard]
* Key count reduced to 128
* State and Type updated to reflect base class changes
[Linux::System::LinuxInputManager]
* AddDevice changed to reflect base class
* Added a keyboard member variable
* Logic in Update for keyboard keypress and keyrelease events implemented
* Keyboard can be added to the input manager
[Linux::System::Keyboard]
* State member function stubbed-out