Various fixes and improvements (#177)

- Remove custom `ESP_TARGET` and use `ESP_PLATFORM` everywhere
- Add `Loader` service functionality to `tt::app::` namespace
- Make `Loader` `PubSub` usable by exposing the messages
- Add board type to crash log
- Don't show SD card in Files app when it's not mounted
- Set default SPI frequency for SD cards
- Move TT_VERSION to scope that works for sim too
- Log Tactility version and board on boot
- Rename "Yellow Board" to "CYD 2432S024C"

Tactility/Source/Tactility.cpp

@@ -141,7 +141,7 @@ static void register_and_start_user_services(const std::vector<const service::Se
 }
 
 void run(const Configuration& config) {
-    TT_LOG_I(TAG, "init started");
+    TT_LOG_D(TAG, "run");
 
     tt_assert(config.hardware);
     const hal::Configuration& hardware = *config.hardware;