Short-hand flags (#1378)

* typo fixes

* Change signature to take in short-hand flags

* update help information

* Parse short-hand flags as their long counterparts

* lints

* Modified a couple tests to use shorthand flags

crates/nu_plugin_binaryview/src/nu/mod.rs

@@ -9,7 +9,7 @@ impl Plugin for BinaryView {
     fn config(&mut self) -> Result<Signature, ShellError> {
         Ok(Signature::build("binaryview")
             .desc("Autoview of binary data.")
-            .switch("lores", "use low resolution output mode"))
+            .switch("lores", "use low resolution output mode", Some('l')))
     }
 
     fn sink(&mut self, call_info: CallInfo, input: Vec<Value>) {