Updated the ZX Spectrum emulator - Fuse.

- Improve ZX Spectrum ULA beeper emulation with separate MIC and speaker paths and improved speaker-response modelling
- Automatically select the appropriate speaker response for each emulated machine, with universal manual overrides
- Preserve snapshot peripheral ROMs across soft resets and correct Multiface ROM handling after a machine reset
- Improve tape trap accuracy, including correct handling of short ROM blocks and ROM flag comparisons
- GTK3, SDL2 and Win32 UIs: coalesce dirty display areas per frame to reduce redundant scaling and presentation work
- Reduce display dirty-tracking memory usage and improve its address decoding
- Avoid rereading startup media files and improve Windows distribution dependency handling
- Expand display, scaler, snapshot, Pokefinder and Z80 disassembler test coverage, including MinGW builds
- Various minor bugfixes and cleanups