Quote arguments when executing in a shell (#118)

* Quote arguments when executing in a shell

Fixes #107

* Parse quotes in `tmux_arguments`

This makes it possible to encode spaces in arguments. Maybe the config
value should be an array instead?

* Print error causes

Co-authored-by: Thomas Schönauer <37108907+DottoDev@users.noreply.github.com>

src/executor.rs

@@ -194,11 +194,12 @@ impl DryCommand {
         print!(
             "Dry running: {} {}",
             self.program.to_string_lossy(),
-            self.args
-                .iter()
-                .map(|a| String::from(a.to_string_lossy()))
-                .collect::<Vec<String>>()
-                .join(" ")
+            shell_words::join(
+                self.args
+                    .iter()
+                    .map(|a| String::from(a.to_string_lossy()))
+                    .collect::<Vec<String>>()
+            )
         );
         match &self.directory {
             Some(dir) => println!(" in {}", dir.to_string_lossy()),