Updated the ZX Spectrum emulator - Fuse.

- Add NTSC TV and replace the PAL TV filters (derived from snes_ntsc by Shay Green)
- Improve tape loading accuracy, including correct pulse levels after loading ROM blocks and proper handling of embedded TZX end-of-block pauses
- GTK UI: stop forcing X11 over Wayland
- SDL2 UI: improve keyboard handling with layout-aware key mapping and tape icon placement on Timex machines
- Win32 UI: improve graphics update performance
- Debugger: add modulo (%) and bit-shift operators to the expression evaluator
- Remove deprecated libjsw support
- Add new unit tests and expand test coverage across the debugger, disassembler, keyboard handling, SDL2, and memory management
- Various minor bugfixes and cleanups