A Tiny Update

Nothing major, just these few changes:

• In addition to the next/previous weapon buttons there are also buttons to select guns directly. For the base game with three guns this isn't that important. However, it made sense to implement it for the planned DLC with four guns. So, since I implemented it anyway, there was no reason to exclude this feature.
• A change in a previous update had the effect, that spheres that can be carried did not have a perfectly round collision shape. Fixed.
• I was made aware that the solution-instructions for level "47. Infinite Translation" were unclear. So I added some explanation to make it (hopefully) easier to understand.
• Small change to level "57. Gravitational Freedom" that avoids an unsolvable state.