during rendering there should be no io updatesduring renderering

This properly limits and scales the size of the output image

This is also recommended by the imgui devs

This option might soon turn into a setting that can be changed as part of the simulator configuration

append moves all values in an array up by one and then appands the new value to the back. now() will replace physics::now()

This removes the need for the posix_memalign and free function. It is also more reliable since the size can more easily be changed during the runtime if needed