Adjust the icon of if statements
Fix a crash with setting an expression cursor

Visualizations that have been deleted, will no longer cause a crash if
they were supposed to receive a cursor.
added qtcreator compability
added compability for qtcreator
changed the pro files back to original and added the
CONFIG+=debug_and_release in the common.pri file
added a clean script similar to make script
Added a cppimport plugin - for now it's just a helloworld, changed
PluginGenerator script with instruction for qtcreator
began to integrate clang libs
Merge branch 'cppimport' of github.com:lukedirtwalker/Envision into cppimport