New:
1. Volume control: added a menu to control sound fx volume.
Improved:
1. Quantity input: now you can also click on a symbol's image to increase or decrease quantities.
2. Tutorial: tweaked some details to make it better.
3. Button icons: added icons to buttons of the planet map screen.
Fixed:
1. Tooltips: added missing tooltips and changed others for clarity.
2. Events activated with keys: when you explored a sector, you could activate events withouth touching them, when you mixed keyboard movement and mouse click movements.
3. Event errors: some planet map and sector map events had errors.
4. Energized transfer: the "energized" property was not supposed to be transferable.
5. Roles window tutorial: the roles tutorial always opened when you opened the roles window, it should only activate the first time you open the window.