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)

CMakeLists.txt

@@ -61,7 +61,7 @@ if (DEFINED ENV{ESP_IDF_VERSION})
     idf_build_set_property(LINK_OPTIONS "-Wl,--wrap=esp_panic_handler" APPEND)
 
     file(READ version.txt TACTILITY_VERSION)
-    add_compile_definitions(TT_VERSION="$TACTILITY_VERSION")
+    add_compile_definitions(TT_VERSION="${TACTILITY_VERSION}")
 else()
     message("Building for sim target")
 endif()