Bugfix and some new functions

- Fixes #1
- Fixes #4
- Fixes #10
- Fixes #11
- Adds `Get paths from environment setings` button in project settings
- Adds sScrollPastEOL to settings (and corresponding option in
environment settings)
- Adds `cOpenRecentProject` to environment settings (and adds
corresponding handler in code)
- Fixes problem, when a user tried to close not saved card