The number of threads is now atleast 1.
Added a very simple about dialog with version number and license.
Replaced all CppCheck's with Cppcheck.
Renamed "show more errors" to "show possible false positives" in the menu.
User created application now has to have a name and a path.
Items are now hidden from the tree and the tree is not recreated everytime it is refreshed.
Also added test.cpp as a sample data for GUI testing.
Added Check all and uncheck all buttons to menu to show/hide all errors more easily.