Maximize Jetson Performance while running sub code

[abrandemuehl]

The jetson has some CPU governors (things that control clock speed) to provide a balance between performance and power consumption. When we are running the code, we should max out the clock speeds of all of the cores and the GPU.

The GPU frequency should be maxed out, the 2 Denver cores should be enabled (https://devtalk.nvidia.com/default/topic/1000345/jetson-tx2/two-cores-disabled-/) and all cpu cores should be set to max frequency. Hopefully, with the 2 extra denver cores, we would actually have a 6 core CPU. However, we may run into issues with the asymmetry of having 2 cores that are technically different.

Hopefully, this will result in a script that we can launch whenever we roslaunch all of our code.

[abrandemuehl]

Also relevant: https://elinux.org/Jetson/Performance#Viewing_the_current_CPU_status

[abrandemuehl]

Running the ~/jetson_clocks.sh script will maximize performance, but we should use the save and restore parameters to turn it off while the kill switch is pressed

[abrandemuehl]

#98 should solve