Reduced memory footprint, skin tones and more

[COM8]

Changes:

• Reduced the memory footprint by switching from string to enum for the Emoji group
• Reduced the memory footprint by storing all Emoji subgroups as static readonly
• Added a SkinTones property
• Updated the HasGlyph to be also valid for multi code point Emoji like "🧑🏼" or "✋🏼".
• Added Windows specific Emoji ("🐱‍👤", "🐱‍🏍", "🐱‍💻", "🐱‍🐉", "🐱‍👓" and "🐱‍🚀")
• Added lists for all Emoji groups (e.g. AnimalsAndNature or PeopleAndBody)
• For all changes I used my Emoji-List-Parser so you might update your parser to be capable supporting these features😉

Documentation:

I updated the README.md documentation for the new SingleEmoji attributes.
WARNING: It still has my "fork from" header in it. I will remove it as soon this PR is ready to be merged.

• SkinTone[] SkinTones: A list of SkinTone objects that represent the current emoji. Example: { SkinTone.NONE } for "😀" , { SkinTone.DARK } for "👨🏿‍⚕️" and { SkinTone.DARK, SkinTone.MEDIUM } for "🧑🏿‍🤝‍🧑🏽". They are in the same order like in the definition of the emoji (Sequence).
• SkinTone[] NoSkinTones: If the emoji does not has a specific skin tone (aka. yellow) SkinTones points to this list.
• Group Group: The Group of the emoji. Example: SMILEYS_AND_EMOTION for "😀" and PEOPLE_AND_BODY for "👨🏿‍⚕️"
• string Subgroup: The subgroup name of the emoji. Example: "face-smiling" for "😀" and "person-role" for "👨🏿‍⚕️"
• bool HasGlyph: Is there a glyph for the emoji defined in the Segoe UI Emoji font.

[sunkhaskasis]

I'd love to see this PR merged, especially because of the skin tone and component emoji on their own.