Breaking changes in v0.19.0:
 - Various resources (config, environment, and runtime files) are consolidated
   into `uwsm` subdirs. Warnings will be issued for encountered old paths, and
   v0.20.0 will drop them. Please migrate.
 - Automatic finalization mechanism. It removes the necessity to run
   `uwsm finalize` in compositors in some/lots of cases.
   v0.20.0 will remove related accomodations from plugins where possible.