* Minor changes to role comparison

New command accepts as arguments to roles as strings and
not role ID's .

New sub-command compare that compares member's
date of arrival, date since last nitro boost,
names, status and roles.

Example: diff member Query#1234 random#4567

Also added thumbnail and color to the builders

* *diff command update*
1. fixed null when color is default color
2. Color is now visible as hex value
3.  not sure about line 101 and 102 method getRed() warning.
4. added information comparison in roles( similar format to roleinfo command )
5. removed most emojis and colors
6. simpler embedbuilders
7. diff member command takes as input mentioned members.