Emulation core improvements:
* Add Covox interface emulation
* Disable accelerate loader while recording RZX files
Miscellaneous improvements:
* Fix typo in Opus Discovery option
* WidgetUI: Disable RollbackTo menu option for widget UIs
* Update description of speed option
* List Melodik as supported interface and rearrange audio interfaces
as a separate item
* Document --volume-covox option and update bash completion
Emulation core improvements:
* Disable tape traps when playing/recording RZX files
Miscellaneous improvements:
* Fix typo in LOG disk format
* Replace old ticket numbers from Trac to Allura
* WidgetUI: Fix memory leak in file selector
* Fix allocator sizeof operand mismatch and remove dead assignment
* Remove prototypes of old plus3 disk functions
* Increase allocated memory to keep GCC7 happy
with filesystems/fuse. From Kamil Rytarowski in PR 50662.
Fuse is the Free Unix Spectrum Emulator.
* Working 48K/128K/+2/+2A Speccy emulation, running at true Speccy speed on any
computer you're likely to try it on.
* Support for loading from .tzx files.
* Sound (on system supporting the Open Sound System or BSD/Solaris).
* Kempston joystick emulation.
* Emulation of the various printers you could attach to the Spectrum.
* Very basic support for RZX files.
