* refactoring for named search (still wip)
libosmscout-import/GenTextDat: builds text trie data files, import module before GenNodeDat
libosmscout-import/GenNodeDat: strips out Name and NameAlt from nodes and writes TextIds
libosmscout-import/GenTextIndex: builds text index for looking up text with TextIds (wip)
libosmscout/TextIndex: text search convenience class that wraps the text index