db.d: finalize after query to output extended result codes

[slook]

• Changed: Use the new sqlite3_prepare_v2() routine since using legacy sqlite3_prepare() is discouraged nowadays
• Removed: sqlite3_reset() is no longer required, since sqlite3_step() procedure resets implicitly if prepared with v2
• Added: sqlite3_finalize() with v2 provides 74 Extended Result Codes in addition to 31 Primary Result Codes
• Fixed: Finalize immediately after each transaction to help prevent resource leaks
• Changed: Throw the short text string description of the final result code instead of duplicating the query string