HTTP and SQL Updates

[gramian]

• Remove leftover open and close endpoint HTTP-API reference entries (Section 7.5)
• Add note on query endpoint regarding question marks
• Add new functions and methods to SQL overview tables (Section 8)
• Add note on escaping percent symbols in format function in SQL function reference (Section 8.1)
• Add concat function to SQL function reference (Section 8.1)
• Add example to exclude function to SQL function reference (Section 8.1)
• Add split and transform methods to SQL method reference (Section 8.2)
• Add ILIKE to SQL filtering operators table (Section 8.3)
• Add ILIKE to SQL syntax appendix (Section 11.5)

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[lvca]

Thanks!