Returns true if string input is currently being captured from the user's keyboard, or false otherwise.
Using the DX11 SET CAPTURE CHARACTER ACTION, certain keys can be set to automatically terminate string capturing when detected, in which case
this function can be used to detect if that happens (such as the user enters his initials for a hi-score table and presses the return key do submit it when done).

Return Boolean = DX11 IS CAPTURING STRING()

This function does not take any parameters.

true if string input is currently being captured, or false otherwise.

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