Stabilize std::convert and related code
          #23875
        
          
      
                
     Merged
            
            
          
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#[stable]the contents of thestd::convertmodule.PathBuf::as_path,OsString::as_os_str,String::as_str,Vec::{as_slice, as_mut_slice}.OsStr::from_strin favor of a new, stable, and moregeneral
OsStr::new.OsString::from_bytesandOsStr::{to_bytes, to_cstring}for ergonomic FFI usage.[breaking-change]
r? @alexcrichton