bugfix: remap keysyms to keycodes after 'MappingNotify', fix #3386257
bugfix: remap keysyms to keycodes after 'MappingNotify', fix #3386257

setxkbmap and xmodmap both might change the keycodes. thus fluxbox needs
to remap the keysyms from the currently loaded keytree to new keycodes
after it received a 'MappingNotify' event.

we do not reload() the keys file because:

* the user might work on it right now
* remap only needed symbols is cheaper than parsing the keysfile anyway

luebking/fluxbox,lukoko/fluxbox,naimdjon/fluxbox,olivergondza/fluxbox,olivergondza/fluxbox,luebking/fluxbox,luebking/fluxbox,lukoko/fluxbox,luebking/fluxbox,Arkq/fluxbox,naimdjon/fluxbox,lukoko/fluxbox,Arkq/fluxbox,Arkq/fluxbox,olivergondza/fluxbox,Arkq/fluxbox,lukoko/fluxbox,naimdjon/fluxbox,naimdjon/fluxbox,luebking/fluxbox,olivergondza/fluxbox,naimdjon/fluxbox,olivergondza/fluxbox,lukoko/fluxbox,Arkq/fluxbox