Better paste format detection

[haggen]

Looking into the data I noticed the API is failing at detecting a chat transcript when there's no character links and defaulting to members list format. We should be more strict when detecting the paste content format, for instance, we could follow the game's policy on character names to detect an invalid paste:

Valid player character names:

• Must be at least 3 characters.
• Cannot exceed 37 characters. (This limit includes one space between the characters name and family name.)
  • Name cannot exceed 24 characters. The name can include a middle name separated by a space.
  • Family name cannot exceed 12 characters.
• May contain the characters A-Z, a-z, 0-9, hyphen-minus and single quotation. (Corporation names may also include the dot character.)
• Space, hyphen-minus and single quotation characters are not allowed as the first or last character in a name.
• Must be unique.

— https://community.eveonline.com/support/policies/naming-policy-en/