2026.7.22.1104 - System Audio capture (excluding Resonite), optimizations — Resonite Steam update #1113479

Hello everyone! I got a small update for you, but with some nice goodies! I've been focusing on the IK for a bit, but my brain got foggy/burned out on it, so I'm focusing on side projects a bit to recover. One of those is Screen Sharing (which we'll start testing soon) and there's one feature trickling in from it that's also useful on itself - system audio capture! For Windows there's now a new audio input, which captures your system audio while excluding Resonite's own audio! This makes it easy to stream in music and other things without shenanigans with virtual audio cables and so on. The library used for this also supports capturing specific process audio - if there's interest, this could be added as well, but will require a bit of extra UI to be made. There's also some small performance optimizations from @Gawdl3y, modernizing our codebase and removing some old Unity cruft and import...