Make compile
Fix test_specialcompletion test
Remove cpp/parser/headergen

Dead code. Untouched since 2007.
convert debuggers/ to new signal/slot syntax

REVIEW: 121049
convert projectmanagers/ to new signal/slot syntax

REVIEW: 121050
Fix compilation
convert languages/ to new signal/slot syntax

REVIEW: 121051
convert all remaining files to new signal/slot syntax

REVIEW: 121055