Add command line utility

[techtonik]

Add python -m psutil that list the most frequent data that are requested from users while troubleshooting:

RAM:  419/3029 MB
CPU:  Intel(R) Core(TM)2 Duo CPU     P8600  @ 2.40GHz
GPU:  Mobile Intel(R) GMA 4500MHD

GPU string for Intel is got from Adapter String, not from Adapter Type, which is "Mobile Intel(R) 4 Series Express Chipset Family".

[giampaolo]

I see little value in returning an arbitrary string which is not easily parse-able. If the user wants to do so he/she can simply do, for example:

python -c "import json, psutil; print(json.dumps(psutil.virtual_memory()))"
[10367352832, 4556836864, 56.0, 7951433728, 2415919104, 3891007488, 1778888704, 229965824, 1910951936]

...and decide what info to retrieve and what serialization format to use.
Also, psutil does not provide those stats about CPU and GPU.

[techtonik]

I see little value in returning an arbitrary string which is not easily parse-able.

Is is not return - it is just a small helper for user space convenience. See godotengine/godot#3546 for an example of how it should be used.