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"

TactilityHeadless/Source/hal/i2c/I2c.cpp

@@ -1,4 +1,4 @@
-#ifdef ESP_TARGET
+#ifdef ESP_PLATFORM
 
 #include "I2c.h"
 #include "Log.h"

TactilityHeadless/Source/hal/i2c/I2cCompat.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#ifdef ESP_TARGET
+#ifdef ESP_PLATFORM
 #include <hal/i2c_types.h>
 #include <driver/i2c.h>
 #else

TactilityHeadless/Source/hal/i2c/I2cMock.cpp

@@ -1,4 +1,4 @@
-#ifndef ESP_TARGET
+#ifndef ESP_PLATFORM
 
 /**
  * This code is based on i2c_manager from https://github.com/ropg/i2c_manager/blob/master/i2c_manager/i2c_manager.c (original has MIT license)