Fileman icon toolbar (#975)

* Add cut/copy/paste menu with icons
* Add icons, file limit to fileman

firmware/application/ui/ui_menu.cpp

@@ -167,6 +167,10 @@ void MenuView::clear() {
 	offset = 0;
 }
 
+size_t MenuView::item_count() const {
+	return menu_items.size();
+}
+
 void MenuView::add_item(MenuItem new_item) {
 	menu_items.push_back(new_item);
 	

firmware/application/ui/ui_menu.hpp

@@ -83,6 +83,7 @@ public:
 	void add_item(MenuItem new_item);
 	void add_items(std::initializer_list<MenuItem> new_items);
 	void clear();
+	size_t item_count() const;
 	
 	MenuItemView* item_view(size_t index) const;