Added simple text search for node types (ways and areas still pending) using libmarisa.
* libosmscout-import/GenTextDat: import module to generate text tries from types saved in the ost file
* libosmscout/TextSearch: simple class that loads and searches through text data generated during import
Added ways and area types to GenTextDat import step, and a demo of how to use TextSearch, "TextLookup" in Demos