Improvements and fixes (#595)

- Fix BluetoothSettings app not updating when toggling on Bluetooth on
- Fix BluetoothSettings app crash when closing while scanning
- Fix BluetoothSettings app crash when turning BT off while scanning
- WebServer doesn't save config anymore as a side-effect of reading the config
- Add missing license headers
- Use TactilityKernel's time and delay functions instead of TactilityFreeRtos ones

TactilityFreeRtos/Include/Tactility/DispatcherThread.h

@@ -46,7 +46,7 @@ public:
     /**
      * Dispatch a message.
      */
-    bool dispatch(const Dispatcher::Function& function, TickType_t timeout = kernel::MAX_TICKS) {
+    bool dispatch(const Dispatcher::Function& function, TickType_t timeout = kernel::FREERTOS_MAX_TICKS) {
         return dispatcher.dispatch(function, timeout);
     }