Various improvements and fixes (#131)

- Added a custom spinner using the Tactility logo
- Fix for crash in version logging
- Make file browsing less verbose in log
- Fix memory leak in FileUtils
- Fix bug when display brightness was set to 255: after reboot it would be set to 0
- Smaller boot logo (removed empty space)

Tactility/Source/app/display/DisplaySettings.cpp

@@ -15,7 +15,7 @@ void setBacklightDuty(uint8_t value) {
 uint8_t getBacklightDuty() {
     int32_t result;
     if (preferences.optInt32(BACKLIGHT_DUTY_KEY, result)) {
-        return (uint8_t)(result % 255);
+        return (uint8_t)(result % 256);
     } else {
         return 200;
     }