[Breaking] Change all time input parameters to milliseconds. (#78)

Changes all functions that accept a time parameter to use milliseconds instead of seconds.

* Adds duration input to NimBLEDevice::startAdvertising and NimBLEServer::startAdvertising.

examples/basic/BLE_scan/main/main.cpp

@@ -17,7 +17,7 @@
 
 extern "C"{void app_main(void);}
 
-int scanTime = 5; //In seconds
+int scanTime = 5 * 1000; // In milliseconds, 0 = scan forever
 BLEScan* pBLEScan;
 
 class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {