2.34.1 bugfix release

* Fix ./play.it uninstallation if shell completions were not installed.
* Improve zsh completion.
* DOSBox: Fix deprecation warnings related to disk images.
* DOSBox: Fix fetching image type from legacy variable.
* Debian: Fix dependencies on Mono libraries.
* Web games: Fix initial paths setting.
* Web games: Prevent Firefox extensions from loading in game windows.
* Web games: Drop calls to retired functions:
  - application_exe_escaped
  - launcher_prefix_symlinks_functions