Fixed includes and include paths to be able to compile QT GUI.
Added QT autogenerated file masks
Added guard to options.h. Never noticed that it was missing...
Added QT-Creator user file pattern
Updated QT-Creator User file to new Qt-Creator 2.6
sysdeps.h is now C++-compatible and makes use of stdbool.h if available.
Added debugging and warning options to CPPFLAGS
Changed sysdeps.h to be more conforming to C99 standard, adding the usage of C99 features.
Use C++11 Standard for C++ files.
Added __cplusplus guards and C++ includes to the system dependency headers to have easier compatibility with C++ source files like in gui-qt.
Fixed errors due to changed option struct. further fixed warnings about NULL in arithmetics, and a signedness issue.