GP Bikes beta21

GP Bikes beta21 available.

Changelog fix: fork simulation fix: "Rocker Swingarm" rear suspension linkage simulation fix: slow-speed “legs” simulation fix: transparent surfaces rendering error fix: memory leak new: possibility to set different springs in the fork new: options to set the external view height and distance new: option to show the HUD even in the onboard views new: option to enable only the L/R or F/B rider lean tracking new: possibility to change the user interface controls new: brakes volume setting new: ban reason new: servers list name filter new: more realistic lighting