Added keyboard navigation capabilities to the globe

[ComBatVision]

Description of the Change

Added the ability to pan, zoom and reset the globe using the keyboard.

• The arrow keys pan the globe
• The '+' and '-' keys zoom the globe
• The 'N' key resets the heading to north up
• The 'R' key resets the heading to north up and the tilt to nadir.

This functionality can be disabled via the KeyboardControls.enabled property.

Why Should This Be In Core?

Many use cases prefer or require keyboard navigation.

Benefits

Keyboard navigation can offer more precision than pointing devices.

Potential Drawbacks

• The mnemonic key assignments (N and R) are not multilingual or configurable.
• Requires the setting of the tabIndex property on the WorldWindow canvas.