Use xkbcommon-compose instead of custom compose table mechanism
Submitted by Thibaut Girka
Link to original bug (#773919)
Description
Parsing and handling X Compose tables should be implemented using xkbcommon-compose instead of the custom table mechanism, which does not honor the XCOMPOSEFILE and XCOMPOSECACHE variables nor the “include” instruction of XCompose files, and may have other divergences with the XCompose spec.
Version: 3.22.x