Next SQLite release changes

[rogerbinns]

• Remove fileio utf8 functions as they are now builtin
• Analyze is now an extension function
• Update apsw.ext.analyze_pages to provide the same info. eg btree depth is missing
• Update apsw.ext.page_usage_to_svg with those updates
• sqlite3_incomplete API may be added which would allow finally fixing apsw shell doesn't understand commented out queries #212
• Update tests/jsonb to use randomjson extension if present from sqlite extra
• Update tools/json_bench.py to do the same