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/app/App.cpp

@@ -0,0 +1,22 @@
+#include "App.h"
+#include "service/loader/Loader.h"
+
+namespace tt::app {
+
+void start(const std::string& id, std::shared_ptr<const Bundle> _Nullable parameters) {
+    service::loader::startApp(id, std::move(parameters));
+}
+
+void stop() {
+    service::loader::stopApp();
+}
+
+std::shared_ptr<app::AppContext> _Nullable getCurrentAppContext() {
+    return service::loader::getCurrentAppContext();
+}
+
+std::shared_ptr<app::App> _Nullable getCurrentApp() {
+    return service::loader::getCurrentApp();
+}
+
+}