[ENHANCEMENTS] Graph improvements

[PassiveLemon]

Is your feature request related to a problem? Please describe.

• The time interval is displayed as Unix time. I can't read Unix time at a quick glance so it can be difficult to determine timestamps. A setting to enable conversion to local time would be nice.
• The timestamp network in/out stats appear to be in bits, some conversion for this would also be nice.
• Viewing in intervals such as last minute, hour, day, week, custom, etc.

Additional context