Make the GPS serial UI smarter at giving progress updates

If onylt he serial monitor handled \r properly.....

iot/main/gps.cpp

@@ -13,6 +13,7 @@ void gps_begin() {
 
 TinyGPSLocation gps_location() {
 	Serial.print("[gps] Getting location: ");
+	uint32_t ms_last_update = millis();
 	// We WILL discover our location - if it's the last thing we do!
 	while(true) {
 		if(millis() > 5000 && gps.charsProcessed() < 10) {
@@ -32,8 +33,9 @@ TinyGPSLocation gps_location() {
 		// If we haven't acquired a lock yet, go around again
 		// Also go around again if the location is the same hasn't yet been updated (GPS devices are strange)
 		if(!gps.location.isValid()) {
-			Serial.print(".");
-			delay(100);
+			// NOTE: It can really take a rather long time to get a lock. Just wait patiently :-)
+			if(millis() - ms_last_update > 500) Serial.print(".");
+			ms_last_update = millis();
 			continue;
 		}