External apps (#1469)

* implemented external app build

* added some ui stuff for testing

* added pacman game

* wired key to pacman game

* fixed pacman drawing issue

* changed afsk rx app to be external

* fixed ui::NavigationView initialization for external apps

* refactoring

* refactoring

* moved m4 image to external app

* added script for external app deployment

* refactoring

* implemented dynamic app listing

* added color to app icon

* improved app loading

* added external apps to sd card content

* refactoring

* review findings

* typo

* review findings

* improved memory management of bitmaps

firmware/application/ui/ui_btngrid.cpp

@@ -116,6 +116,12 @@ void BtnGridView::add_items(std::initializer_list<GridItem> new_items) {
     update_items();
 }
 
+void BtnGridView::add_item(GridItem new_item) {
+    menu_items.push_back(new_item);
+
+    update_items();
+}
+
 void BtnGridView::update_items() {
     size_t i = 0;
 

firmware/application/ui/ui_btngrid.hpp

@@ -54,6 +54,7 @@ class BtnGridView : public View {
     ~BtnGridView();
 
     void add_items(std::initializer_list<GridItem> new_items);
+    void add_item(GridItem new_item);
     void set_max_rows(int rows);
     int rows();
     void clear();