build 190902. vehicle derailment, oil pressure change tweak, inverter sound tweak, car braking logic tweak, flashing alerter ui indicator, departure signal sources reduction, additional train state data exposed to uart interface, additional train state data for python scripts, wind simulation tweak, coupler animation fix

uart.h

@@ -27,6 +27,8 @@ public:
         float hvuart = 65535.0f;
         float currentmax = 10000.0f;
         float currentuart = 65535.0f;
+        float lvmax = 150.0f;
+        float lvuart = 65535.0f;
 
         bool mainenable = true;
         bool scndenable = true;
@@ -66,4 +68,5 @@ private:
     std::chrono::time_point<std::chrono::high_resolution_clock> last_update;
     conf_t conf;
 	bool data_pending = false;
+    std::uint8_t m_trainstatecab { 0 }; // helper, keeps track of last active cab. 0: front cab, 1: rear cab
 };