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"

Boards/CYD-2432S024C/Source/YellowConfig.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "driver/spi_common.h"
+#include "driver/i2c.h"
+#include "driver/gpio.h"
+#include "hal/YellowDisplayConstants.h"
+
+// SPI 2 - display
+#define TWODOTFOUR_SPI2_PIN_SCLK GPIO_NUM_14
+#define TWODOTFOUR_SPI2_PIN_MOSI GPIO_NUM_13
+#define TWODOTFOUR_SPI2_TRANSACTION_LIMIT TWODOTFOUR_LCD_DRAW_BUFFER_SIZE
+
+// SPI 3 - sdcard
+#define TWODOTFOUR_SPI3_PIN_SCLK GPIO_NUM_18
+#define TWODOTFOUR_SPI3_PIN_MOSI GPIO_NUM_23
+#define TWODOTFOUR_SPI3_PIN_MISO GPIO_NUM_19
+#define TWODOTFOUR_SPI3_TRANSACTION_LIMIT 8192 // TODO: Determine proper limit