On Linux and macOS, using Clang to compile OpenStarbound produces about 400 MB worth of warnings during the build, making the compiler output unreadable and slowing the build down considerably.
99% of the warnings were unqualified uses of std::move and std::forward, which are now all properly qualified.
Fixed a few other minor warnings about non-virtual destructors and some uses of std::move preventing copy elision on temporary objects.
Most remaining warnings are now unused parameters.
You can now right click empty slots to insert one from swap.
Added unique sounds for the swap slot count incrementing/decrementing.
Material placement now plays sounds.
