New Tutorial, improved Invite Friend dialogue, easier votekick

- New (basic) tutorial map! This new tutorial covers the basics on the pitch in realistic match scenarios in over 20 tasks. The old tutorial will be readded as a bonus fun map that you unlock when you reach a certain level - another advanced tutorial map will come later, it will feature pro stuff like boosting, momentum, roll spins, hard volleys, far-dashing and more.
- Newly added Steam Friends now immediately appear in the "Invite Friends" window without restarting the launcher
Fixed that in the "Invite Friends" window sometimes the wrong people are selected
- Added "Clear selected" button to "Invite Friends" window to unselect everyone. Useful when you first invite 10 friends and then want to invite 3 other friends - so when you first clear the selection you will not reinvite the first 10 friends again.
- Fixed that people who are already in the lobby/party will not receive an invite
- "Invite Friends" window now shows people who are "Playing Supraball" first on top of the list
- Improved the look of kick/shot/ball effects in low "effect quality"
- Ball effects are now more transparent and the smoke of a hard shot is smaller. All in all there are less distractions that blocked the view.
- Public kickvoting now initiates after 1 vote instead after 4