Add File > Scripts > Rescan option to rescan the available scripts

https://community.aseprite.org/t/6170/6

data/gui.xml

@@ -635,6 +635,7 @@
         <separator id="scripts_menu_separator" />
         <menu id="scripts_menu" text="@.file_scripts" group="file_scripts">
           <item command="OpenScriptFolder" text="@.file_open_script_folder" />
+          <item command="Refresh" text="@.file_rescan_script_folder" />
         </menu>
         <separator group="file_app" />
         <item command="Exit" text="@.file_exit" />

data/strings/en.ini

@@ -803,6 +803,7 @@ file_export_sprite_sheet = &Export Sprite Sheet
 file_repeat_last_export = Repeat &Last Export
 file_scripts = Scri&pts
 file_open_script_folder = &Open Scripts Folder
+file_rescan_script_folder = &Rescan Scripts Folder
 file_exit = E&xit
 edit = &Edit
 edit_undo = &Undo

src/app/commands/cmd_refresh.cpp

@@ -10,7 +10,10 @@
 #endif
 
 #include "app/app.h"
+#include "app/app_menus.h"
 #include "app/commands/command.h"
+#include "app/ui/main_menu_bar.h"
+#include "app/ui/main_window.h"
 #include "app/ui/status_bar.h"
 #include "fmt/format.h"
 #include "ui/scale.h"
@@ -40,8 +43,15 @@ RefreshCommand::RefreshCommand()
 
 void RefreshCommand::onExecute(Context* context)
 {
+  // Reload menus (mainly to reload the File > Scripts menu)
+  //AppMenus::instance()->reload();
+  App::instance()->mainWindow()->getMenuBar()->reload();
+
+  // Reload theme
   ui::set_theme(ui::get_theme(),
                 ui::guiscale());
+
+  // Redraw screen
   app_refresh_screen();
 
   // Print memory information