timezone offset is now stored as float to allow half hour offsets

examples/companion_radio/MyMesh.cpp

@@ -2192,11 +2192,11 @@ bool MyMesh::handleCommand(const char* command, uint32_t sender_timestamp, char*
   }
 
   if (strcmp(command, "get tz.offset") == 0) {
-    sprintf(reply, "> %d", _prefs.tz_offset);
+    sprintf(reply, "> %.1f", _prefs.tz_offset);
     return true;
   }
   if (memcmp(command, "set tz.offset ", 14) == 0) {
-    int8_t tz = atof(&command[14]);
+    float tz = atof(&command[14]);
     if (tz < -12 || tz > 14) {
       strcpy(reply, "Error, must be from -12 to +14");
     } else {

examples/companion_radio/NodePrefs.h

@@ -47,7 +47,7 @@ public:
   uint8_t agc_reset_interval = 0;  // secs / 4
   char default_scope_name[31];
   uint8_t default_scope_key[16];
-  int8_t tz_offset = 0;
+  float tz_offset = 0;
 #ifdef ENABLE_WIFI_INTERFACE
   #ifndef WIFI_SSID
     #define WIFI_SSID ""