Allow to search by tag categories

The server accepts a list of tag categories for inclusion and
exclusion. The categories in the include list imply to return items
that have at least one tag of each category. The categories in the
exclude list imply to return all items that have no tag in any of
these categories.

modules/restserver/src/main/scala/docspell/restserver/conv/Conversions.scala

@@ -124,6 +124,8 @@ trait Conversions {
       m.folder,
       m.tagsInclude.map(Ident.unsafe),
       m.tagsExclude.map(Ident.unsafe),
+      m.tagCategoriesInclude,
+      m.tagCategoriesExclude,
       m.dateFrom,
       m.dateUntil,
       m.dueDateFrom,