Add declarations for new static variables in input::environment; move utility functio...

Add declarations for new static variables in input::environment; move utility functions in ui/input.h to the class definition of input in order to avoid link errors; add restrictions on setting of variables from outside of the environment class, making ---this and ---chain protected; set a ---this variable; add a C string token reader to ui::input; add a function to evaluate streams; and add code to call environment and token stream handlers to the input handling method.

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