Add a commit menu to the commit message panel

And move the "switch to editor" command into this menu. So far this is the only
entry, but we'll add another one in the next commit.

pkg/config/user_config.go

@@ -469,7 +469,7 @@ type KeybindingSubmodulesConfig struct {
 }
 
 type KeybindingCommitMessageConfig struct {
-	SwitchToEditor string `yaml:"switchToEditor"`
+	CommitMenu string `yaml:"commitMenu"`
 }
 
 // OSConfig contains config on the level of the os
@@ -866,7 +866,7 @@ func GetDefaultConfig() *UserConfig {
 				BulkMenu: "b",
 			},
 			CommitMessage: KeybindingCommitMessageConfig{
-				SwitchToEditor: "<c-o>",
+				CommitMenu: "<c-o>",
 			},
 		},
 		OS:                           OSConfig{},