`tune`: new command to profile the existing computer and set up optimal qsv settings for speed

[jqnatividad]

qsv has many performance settings. Make it trivial to set it to optimal settings with the tune command.

It will take into account the current machine's capabilities:

• Available memory
• Disk space, Disk type (HDD or SDD)
• CPU architecture
• Network connection/throughput
• etc

And save the settings in the .env file.

[jqnatividad]

This can be done by a shell script.