- Adding category table and category field in attribute table
- When getting types, sorting by category first, than by name

This is more flexible, since the file doesn't need to be in 'src/SGalinski/TypoScriptBackendBundle/Resources/Data/' directory

This makes properties of same type to be unique.
But, it doesn't make type names unique if the types extend different superType

WHERE attribute.deleted IS NULL OR attribute.deleted = FALSE

Exported file doesnt have versions because default versions (1.0 - 7.4) are removed from import function

- minVersion == NULL is treated as it is earliest version
- maxVersion == NULL is treated as latest (current) version

Also making some comments.

*In progress*