Update guide

Checklist for adding values to TADST and config files

1. Create control in MainForm
2. Setup interactive details
3. Create corresponding properties in Profile
4. Set up default values in Profile
5. Create handlers in MainForm to update _activeProfile properties on value change
6. Add controls to the UpdateGui function (in the most appropriate called sub-function)
7. Set up FileHandler to handle the value from ActiveProfile to add it to config files or to GetStartupParameters() in Profile