Modernize kb layouts

[mtwebster]

ref: linuxmint/cinnamon#12758

[Fantu]

Hi, this PR remove some functions (looking symbols file), normally in cinnamon software you didn't soname dump even if should be done on api break but as xapp is used also by other softwares out of cinnamon (where for example on Debian I do strict deps, break of reverse deps and upload simultaneous upload of all components involved as a workaround), so I think that is good do soname bump.

[clefebvre]

Hi, this PR remove some functions (looking symbols file), normally in cinnamon software you didn't soname dump even if should be done on api break but as xapp is used also by other softwares out of cinnamon (where for example on Debian I do strict deps, break of reverse deps and upload simultaneous upload of all components involved as a workaround), so I think that is good do soname bump.

I agree in theory though I think this has only been used by slick-greeter, cinnamon and cinnamon-screensaver. Do you know of any other software using this?

If so it's not a bump we actually need, it's to keep it in.

[clefebvre]

I'll merge for now. We can revert if this is needed.

[Fantu]

slick-greeter don't seems that use xapp, or there are incomplete deps? https://github.com/linuxmint/slick-greeter/blob/master/debian/control
the most critical and essential thing would be to at least know if the removed APIs are used by other software outside of the cinnamon components.
Regarding the cinnamon components, as I've seen several times in Debian broken APIs without soname dumps, I assume the maintainers of other distros have also seen them and are acting accordingly to limit the problems. Perhaps at least increasing the major version (to 3) of the xapp version, which will include this change, will help ensure more thorough checking.