Set Program Arguments Improvements

- + show current program args when setting them (easier to quickly modify current args or view the arguments set without the need to go in the config)
- + automatically select current program args text when initially changing it (so that clearing the prog args or completely changing them can be done without friction)
- + status message when cancelling the `Set Program Arguments` command (to indicate that the arguments remained the same)
- ! fix set_program_arguments that didn't get its arg1 and arg2 added as parameters on recent refactor
- * refactor `javatar_settings` to avoid duplication of the `sublime timeout + show_status` sequence (see member function `show_delayed_status` in `javatar_settings`)