internals can accept an argument. :focus does accept one

Both in input and in configuration.
This allowed to remove the :focus_user_home and :focus_root
internals.

It's now possible to define a verb like

```
[[verbs]]
key = "ctrl-h"
invocation = "home"
execution = ":focus ~/dev"
```

which can be called as ctrl-h, :home, but also :!home
(in order to open the ~/dev directory in a new panel)

1 files changed, 4 insertions, 12 deletions

diff --git a/src/verb/verb_store.rs b/src/verb/verb_store.rs
index 9bfeefd..448b3e0 100644
--- a/src/verb/verb_store.rs
+++ b/src/verb/verb_store.rs
@@ -48,25 +48,17 @@ impl VerbStore {
         let mut nb_found = 0;
         let mut completions: Vec<&str> = Vec::new();
         for (index, verb) in self.verbs.iter().enumerate() {
-            if let Some(shortcut) = &verb.shortcut {
-                if shortcut.starts_with(prefix) {
-                    if shortcut == prefix {
+            for name in &verb.names {
+                if name.starts_with(prefix) {
+                    if name == prefix {
                         return PrefixSearchResult::Match(&verb);
                     }
                     found_index = index;
                     nb_found += 1;
-                    completions.push(&shortcut);
+                    completions.push(name);
                     continue;
                 }
             }
-            if verb.name.starts_with(prefix) {
-                if verb.name == prefix {
-                    return PrefixSearchResult::Match(&verb);
-                }
-                found_index = index;
-                nb_found += 1;
-                completions.push(&verb.name);
-            }
         }
         match nb_found {
             0 => PrefixSearchResult::NoMatch,