Fuel Consumption HUD

Displays fuel usage in l/h for combustion engine vehicles and instantaneous power in kW for electric vehicles. Anchored to the bottom-right HUD corner and scales with the UI. Hidden for other vehicle types. Changelog Version 1.1.0.0: Significant internal improvements - Robust consumption estimator: * Exponential Moving Average (EMA) smoothing and adaptive smoothing for ECU "lastFuel" readings and electric power estimates. * Event-driven fill-level delta estimator with anti-spike measures (median + trimmed-mean + stability check). * Plausibility filtering (ignores unreliable readings) - Electric behaviour improvements: * Shows instantaneous power (kW) while the electric motor is ON even when stationary. * Shows 0.0 when the motor is OFF to avoid confusing residual values. * Improved consumer-based fallback estimation for electric power usage. - Faster, more responsive internal sampling while keeping the on-screen display stable. - HUD appears instantly when you enter a vehicle (placeholder shown immediately; accurate values follow shortly). - Smoother, more plausible readings with reduced spikes and erratic values. - UI scaling fixes: HUD position and size stay consistent across UI scales (including small scales such as 50%). - Respects in-game HUD visibility (won't show when the in‑game UI is hidden). - Stability fixes: added runtime guards to avoid rare "attempt to call a nil value" crashes.