Add Xcode support to gitignore
Bugfix: LANGUAGEDIR
Delete QT3_US_SUPPORT from all CMakesLists.txt

SET( QT_USE_QT3SUPPORT TRUE ) is delete from all CmakeLists.txt and adapting the souces, but "FIND_PACKAGE( Qt4 4.6.3 REQUIRED QtCore QtGui Qt3Support QtSvg QtXml QtScript)" in the root-CMakeLists.txt is unchanged. So Q3*-Header like Q3PtrList will not produce an error.
Formattings and comment deletion

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cmake: remove debug message
osx: fix icon qucs-rescodes