Add date/day to clock, proportional fonts

src/WatchFeatures/RTC.h

@@ -16,6 +16,7 @@ public:
   void Get(tmElements_t & tm);
   void Set(tmElements_t tm);
   uint64_t GetTimestamp();
+  std::string GetDateString();
   void SetTimer();
   bool CheckWakeup(); // Checks to really wake up or not, also resets the timer after the initial sleep
   void Resync(); // Resync the timer cycle, both initially and after RTC resync