Add ODBC QSQL Database driver
Column "public" in public_keys table is a keyword in
MSSQL. Double quote it.
Double quotes are invalid on MySQL in non-ANSI mode.
Force ANSI mode for MySQL/MariaDB databases.
MSSQL also has a maximum VARCHAR of 8000
Schema updates are not performed for each new database.
New databases are immediately created conforming to schema:7
Schema 5 and 6 get updated to 7.
Schemas < 5 never have been released officially. (pre 2.0.0)
Switch "Database name" label to "DSN" for ODBC databases.
Add settings class to access the settings table in the database
Cache values and improve database writes.
Options dialog simplified
Replace getSetting / storeSetting
Unpack option flags to rows in the settings
