Changed build configuration. From now on, the executable will be placed in bin/. The postbuild.* scripts for Linux and Windows will place important files in bin/ and bin/data/. Added hasType() to class Expression. Added search() to class Scope. Added DontKnowYet to struct Types.

#!/bin/bash
FILES=`echo -n src/{html.css,html_map.d,lang_de.d,lang_en.d,lang_fi.d,lang_tr.d,macros_dil.ddoc,predefined.ddoc,predefined_xml.ddoc,xml.css,xml_map.d}`
cp src/config.d bin/
cp $FILES bin/data/