Control Improvements in Allspace

I posted Build 20200624 of Allspace. This build includes the following improvements:
1) Fixed background color on selected menu button in Controls page.
2) Refactored the default throttle control scheme for game controllers and Oculus touch controllers. Previously, the y-axis on the left analog stick was a direct analog throttle control. This meant players had to constantly hold the position on the y-axis to maintain throttle level. The new throttle design implements Throttle Up and Throttle Down actions using the left stick. So now players do not need to hold that stick. They can set their desired throttle level and then let go of that stick if they want. Note: HOTAS joystick throttle input is unchanged.