Package alterator-module-backend3: Information

- Fix GMainContext for method timeout.
- Fix forced backend3 process termination and its child processes. Before this
  fix, when the backend3 process was forcefully terminated, its child
  processes were not terminated.
- Fix typo in warning.

- Add the ability to supplement the input parameter with variables from the
  environment subtable in the method description. Values for such variables
  are taken from the sender's environment variable table. If this table does
  not contain values for the specified variables, values are taken from the
  environment subtable in the method description. Values passed via the input
  parameter have higher priority and override values from the environment
  subtable of method and sender's environment variable table.

- Add passing of D-Bus methods parameters to the backend3 scripts.