Color added to main data types

[Happy4Game]

I added colors to the most used data types, replace "?" by NULL and use the font 'monospace'

#418

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Name	Status	Preview	Comments	Updated (UTC)
drawdb	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2025 6:36pm

[IgelVV]

NULL is more obvious than "?", but it takes more space — so I prefer "?".
But using colors is a great idea!