DONE
+ Check file, package, project (all) commands.
+ TheIDe linter keyboard shortcuts for check file, package, and project commands.
+ TheIDE linter setup pane in Setup dialog.
+ Ability to select severity message types.
+ Core configuration settings (language, standard, platform, etc.)

TODO:
- Add Windows cppcheck executable detection.
- Add configurable cppcheck build dir path (to speed-up analysis)
- Add library file support.
- Add Package/File list menu entries.
- Add CLANG backend switch.
- Add the ability to pass additional command line options.
- Filter out non C/C++ files (*.tpp, *.log, etc).