[Improvement] Use psutil for CPU info on Linux

After having read some documentation such as the material found [here](https://pythonhosted.org/psutil/), I will look into primarily utilizing `psutil` for CPU information on Linux systems as the go-to.

It seems `psutil` is capable of report(ing) "the real-time value" for CPU frequency. However, on all other systems `cpuinfo` will remain the primary library for gathering this information.

It may not be common knowledge, but at least on Windows systems, `cpuinfo` utilizes registry actions to accurately report the CPU frequency. However, at least on Linux systems, `psutil` is capable of reporting the accurate frequency without the use of registry or otherwise.