Sound Physics: Aeronautics

Sound Physics Aeronautics 1.4.0 -- E pluribus unum

This was meant to be bundled in with the much large (still coming) update that brings portals 2.0 and a config/performance overhaul but portals are proving difficult to perfect. So I split the solid performance items into this standalone update, with the rest to come soon^TM.

• Major acoustic performance improvements, reducing duplicated calculations and reusing results where they can be proven equivalent "from many, one" this should highly reduce the performance hit when using multiple propellers.
• Reworked Aeronautics propeller acoustics around physical propeller groups, allowing paired loop sounds to share one authoritative environmental and multipath evaluation while retaining their individual sound presentation.
• Improved enclosure continuity during contraption geometry and topology changes, reducing false indoor/outdoor transitions while structures are moving or rebuilding.
• Hardened multipath rendering in general in preperation for broader portal routing aimed at addressing a shortfall of the original SPR mod.
• Added highly experimental speed-of-sound acoustic delay and sonic-boom presentation. This remains disabled by default and should definetly stay that way. This is just groundwork for a coming update.
• Significantly expanded diagnostics.
• Fixed compatability with Tacz tweaks (and probably many other mods that were intended to hook into the original SPR mod)