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/UnPhone/Source/hal/UnPhoneSdCard.cpp

@@ -5,7 +5,6 @@
 
 #include <esp_vfs_fat.h>
 
-#define UNPHONE_SDCARD_SPI_FREQUENCY 20000000U
 #define UNPHONE_SDCARD_PIN_CS GPIO_NUM_43
 #define UNPHONE_LCD_PIN_CS GPIO_NUM_48
 #define UNPHONE_LORA_PIN_CS GPIO_NUM_44
@@ -13,7 +12,6 @@
 
 std::shared_ptr<SdCard> createUnPhoneSdCard() {
     auto* configuration = new tt::hal::SpiSdCard::Config(
-        UNPHONE_SDCARD_SPI_FREQUENCY,
         UNPHONE_SDCARD_PIN_CS,
         GPIO_NUM_NC,
         GPIO_NUM_NC,