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

fix helper tests

This ensures that the helper is working as intended for backwards
compatibility. New tests for the new class still have to be added.

Upgrading tests

added test for serializing

close PDOstatements in unittests

close PDOStatement object when in a state of having unfetched rows.

fix strict warnings in tests

put tests into their own group

dropped support for referencing specific row in res2row

This is not possible in Sqlite3 (PDO) because of the lack of scrollable
cursors.

do not count changes of an empty result

added a way to force sqlite2 in the tests

corrected string detected

sqlite only allows single quoted strings and uses doubled single quotes
for escaping

statebased parser for splitting SQL strings

the RegExp approach segfaulted on larger inputs (eg. full database
dumps). The new approach can also handle comments and multiline strings.

Add unit tests for functions that referers to the different sqlite backends