setup() and preload() runs only when VR is entered for first time

[vedhant]

When VR is exited by clicking the little cross on the corner and when it is entered again by clicking "Enter VR" (without page refreshing), setup() and preload() do not run. Only draw() loop runs on subsequent VR sessions.
This is happening because p5 global object is being made only once. Exiting out of VR session does not remove p5 global instance.

Also, VR continues from where it left off when re entered. This is because the global variables are not reset on the next VR session.