Allow passing parameters as multiple function args

This is what the old query methods allowed. Passing in an array is still
somewhat cleaner, but allowing separate arguments should make porting
olde

Allow passing parameters as multiple function args

This is what the old query methods allowed. Passing in an array is still
somewhat cleaner, but allowing separate arguments should make porting
older code a bit more convenient.

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Added queryKeyValueList convenience method

This is a common use case in plugins

renamed getDB to getPdo

This is clearer in what to expect as a return value

fix calls to non existing method pdo()

added tests for SQLiteDB class