Removes uneeded entries in .giignore file.
Corrects bugs in CMake install target.
Adds command in install and uninstall targets to recreate the gtk icons cache.
Creates INSTALL.md file with instructions to build, install and uninstall ClassCreator.
Deletes config.hpp. This file is autogenerated by cmake using a template.
Eliminates the app icon from the resources in main.cpp. The app icon is set in the .desktop file.