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"

TactilityCore/Source/Check.cpp

@@ -31,7 +31,7 @@ TT_NORETURN void _crash() {
     logTaskInfo();
     logMemoryInfo();
     // TODO: Add breakpoint when debugger is attached.
-#ifdef ESP_TARGET
+#ifdef ESP_PLATFORM
     esp_system_abort("System halted. Connect debugger for more info.");
 #endif
     __builtin_unreachable();