Possible issue with CheckForTextualData

[g2petter]

I'm not sure if it's correct to report this as an issue, but I ran into a problem with the CheckForTextualData function, in particular this check:

else if (rawData[i - 1] == 0 && rawData[i] < 10) { ++controlSequences; }

The char represented by the number 9 is Tab. I'm working with an ERP system that requires export files to be Tab-separated, so when I passed in an exported string with lots of tabs, it failed to pass this test. The solution was to check rawData[i] < 9 instead of rawData[i] < 10

[khalidsalomao]

Hi @g2petter , could you submit a PR with the fix and some test conditions?