Gesture auto-complete, similar to emojis/mentions

[gwigz]

New gesture picker for nearby chat slash gesture autocomplete. Shown when the user types / nearby chat, matching active gestures instead of relying only on inline text completion.

• LLGestureAutocompleteHelper following the existing LLChatMentionHelper/LLEmojiHelper autocomplete pattern
• LLFloaterGestureAutocompletePicker and XUI for displaying matching gesture triggers and names.
• Wires nearby chat to build gesture matches from active LLGestureMgr entries
• Supports keyboard selection through the same LLTextEditor helper key-forwarding path used by other autocomplete helpers
• Respects the existing ChatAutocompleteGestures chat preference

Preview only shown in nearby chat, for active / prefixed triggers, like /wave.

Also ignores anything that doesn't match gestures, as you'd expect.

Ported from secondlife/viewer#5919.

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[gwigz]

need to check this applies RLV restrictions (probably doesn't matter here?)

and consider adding settings around it, perhaps some to include chat commands in the list too and hints for their parameters

[gwigz]

also need to look into why this, mentions, and emoji are playing open/close floater sounds