Button functionality using MCP23017 interrupts and bugfixes

src/screens/time.cpp

@@ -26,6 +26,10 @@ void TimeScreen::onNewMinute() {
     TimeScreen::showScreen();
 }
 
+void TimeScreen::onActivate() {
+    TimeScreen::showScreen();
+}
+
 std::array<String, 7> TimeScreen::getEpdContent() {
     return TimeScreen::epdContent;
 }

src/screens/time.hpp

@@ -15,6 +15,7 @@ class TimeScreen {
         static void init();
         static void showScreen();
         static void onNewMinute();
+        static void onActivate();
         static std::array<String, 7> getEpdContent();
         static TimeScreen* getInstance();
 };