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

Devices/unphone/source/drivers/unphone_nav_buttons.cpp

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 #include "unphone_nav_buttons.h"
 
+#include <tactility/delay.h>
 #include <tactility/device.h>
 #include <tactility/driver.h>
 #include <tactility/drivers/gpio_controller.h>
@@ -76,9 +77,9 @@ static int32_t nav_buttons_thread_main(UnphoneNavButtonsInternal* internal) {
 
             // Debounce all events for a short period of time
             // This is easier than keeping track when each button was last pressed
-            tt::kernel::delayMillis(50);
+            delay_millis(50);
             xQueueReset(internal->event_queue);
-            tt::kernel::delayMillis(50);
+            delay_millis(50);
             xQueueReset(internal->event_queue);
         }
     }