Parse EDID data

[lvps]

EDID data is reported by monitors. There may be useful info about the monitor.

Grab data from... the journal? It's printed there usually, but I hope there's also a better way, maybe from /dev. It's also a bunch of hex values, so we need some advanced parsing.

Add a command line switch to parse it. Not sure if it should be monitor only or everything + monitor, maybe we need a --computer and --no-computer and --monitor and --no-monitor with --computer and --no-monitor as defaults, there should be a simple way to do these --something and --no-something switches in argparse.

Features to look for, if they exist (I'm not sure which kind of data is there):

• brand
• model
• sn
• diagonal-inch
• screen-resolution (doesn't exist in tarallo but it will be added, stuff like 1920x1080)
• number and type of ports?