* trying to make app_id and class exchangeable
* still fails to hand over the argument
* make both app_id and class be set by command line arguments
* added missing cfg for class
* Changes as requested. Putting the os check in a block however doesn't
work for me
* getting rid of superfluous to_string()
* x11-class argument gets ignored
* changed argument name
* Update src/cmd_line.rs
* changed faulty unwrap
* added missing comma
* fixed wrong case
* fixed class
* make cargo fmt happy
* exchanged String::from with String::new
* make both attributes also overrideable via env::var
Co-authored-by: partizan <serg.partizan@gmail.com>