chain word and better save/load UI

src/state/modal.rs

@@ -1,4 +1,5 @@
 use crate::state::editor::PatternField;
+use crate::state::file_browser::FileBrowserState;
 
 #[derive(Clone, PartialEq, Eq)]
 pub enum Modal {
@@ -21,8 +22,7 @@ pub enum Modal {
         bank: usize,
         selected: bool,
     },
-    SaveAs(String),
-    LoadFrom(String),
+    FileBrowser(FileBrowserState),
     RenameBank {
         bank: usize,
         name: String,