simplified data type table

[amlaenxc]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number. Closes #316

Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes. Simplified the changes to the descriptions of the data types in SQLite, since SQLite & the DB Browser for SQLite only use these data types anyway. Though, I don't believe the discussion in #316 was quite correct about exactly what the data types are, and went by the documentation for SQLite: https://www.sqlite.org/datatype3.html

If any relevant discussions have taken place elsewhere, please provide links to these.

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