Add Preference that allows users to select default behavior when pressing letter keys

New Description
Please add a preference on the General tab of Preferences as follows:

Label: Pressing letter keys:
Radio Buttons: ( ) Starts local chat ( ) Affects movement (ie. WASD)

Default: (o) Affects movement (ie. WASD)

See design in STORM-425

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Original Description
The "you start jumping when you type" bug is back.

When focus is in world, and there is no input element in the focused window, focus has to stay in the chat bar.

[Note to all the people saying they need WASD, this is not about removing WASD movement, it is about restoring an "option" for people who do not use WASD]