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"

Buildscripts/CMake/TactilitySDK.cmake

@@ -6,8 +6,6 @@ endfunction()
 
 macro(tactility_project project_name)
     set(TACTILITY_SKIP_SPIFFS 1)
-    add_definitions(-DESP_TARGET)
-    add_compile_definitions(ESP_TARGET)
 
     include("${TACTILITY_SDK_PATH}/Libraries/elf_loader/elf_loader.cmake")
     project_elf($project_name)