Minor fixes and new features

- Small change in the sample code (translated to English)
- Small change in project and environment settings (changed event
`OnClick` to `OnChange`)
- Adjustment to the new compiler
- Fixed some texts in Polish translation
- When closing form, newly created project is saved onto the "Recently
opened" list
- Enables saving compiler messages into file or clipboard
- Fixed loading a language file from another (than default) work
directory
- Fixed the `%newline%` marker in language file
- Fixed form maximizing on run
- Closes #6
- Closes #12