Remade save/load handling, code fixes

1.2
- Removed unused variable (Enabled).
- Remade save/load code.
- Removed unecessary save/load related functions (GetCurrentFolder).
- Removed unecessary code in save/load functions.
- Made all save/load string handling wide (32 bit).
- Older setting files are no longer compatible.

Release notes:
- Settings are saved/loaded in a different way, old files not
compatible.
- Fixed not being able to press the notification balloon when starting
minimized.