Csv read/write should be culture invariant

[stalhandske]

Since YarnSpinner string tables are generated on the build machine and could potentially be read by any device executing the game, the CsvHelper should use culture invariant formatting of the csv it generates and reads.

To fix this for myself i simply changed line 100 in YarnImport.cs to

var csv = new CsvHelper.CsvWriter(textWriter,new CsvHelper.Configuration.Configuration(System.Globalization.CultureInfo.InvariantCulture));

And something similar in DialogueRunner.cs

Note: string tables should be regenerated after this change (right click >> reimport)