Various improvements (#547)

- Fixed crash when returning to Setup app (from any of the steps)
- Fixed crash when returning to TimeDateSettings app (after locale selection)
- Fixed GuiService inconsistent behaviour: now always perform operations async (e.g. to show/hide apps). This fixes crashes in some onHide() calls where onHide() might be called before onShow() was called.
- Fix for incorrect WebServService path
- Remove CYD-4848S040C SD card functionality, but added a GPIO fix for releasing 3-wire SPI pin sharing.
- Fix for saving/loading settings for various apps

Tactility/Private/Tactility/PartitionsEsp.h

@@ -7,7 +7,7 @@
 
 namespace tt {
 
-esp_err_t initPartitionsEsp();
+bool initPartitionsEsp();
 wl_handle_t getDataPartitionWlHandle();
 
 } // namespace

Tactility/Private/Tactility/app/chat/ChatSettings.h

@@ -24,7 +24,6 @@ struct ChatSettingsData {
 
 ChatSettingsData loadSettings();
 bool saveSettings(const ChatSettingsData& settings);
-ChatSettingsData getDefaultSettings();
 bool settingsFileExists();
 
 } // namespace tt::app::chat

Tactility/Private/Tactility/service/gui/GuiService.h

@@ -7,16 +7,13 @@
 #include <Tactility/service/Service.h>
 #include <Tactility/service/loader/Loader.h>
 
+#include <tactility/concurrent/dispatcher.h>
+
 #include <cstdio>
 #include <lvgl.h>
 
 namespace tt::service::gui {
 
-constexpr auto GUI_THREAD_FLAG_DRAW = (1 << 0);
-constexpr auto GUI_THREAD_FLAG_INPUT = (1 << 1);
-constexpr auto GUI_THREAD_FLAG_EXIT = (1 << 2);
-constexpr auto GUI_THREAD_FLAG_ALL = (GUI_THREAD_FLAG_DRAW | GUI_THREAD_FLAG_INPUT | GUI_THREAD_FLAG_EXIT);
-
 /**
  * Output a log warning if the current task is the GUI task.
  * This is meant for code that should either create their own task or use a different task to execute on.
@@ -28,7 +25,8 @@ class GuiService final : public Service {
 
     // Thread and lock
     Thread* thread = nullptr;
-    EventGroup threadFlags;
+    DispatcherHandle_t dispatcher = nullptr;
+    bool exitRequested = false;
     RecursiveMutex mutex;
     PubSub<loader::LoaderService::Event>::SubscriptionHandle loader_pubsub_subscription = nullptr;
 
@@ -46,6 +44,8 @@ class GuiService final : public Service {
 
     static int32_t guiMain();
 
+    static void onGuiDispatch(void* context);
+
     void onLoaderEvent(loader::LoaderService::Event event);
 
     lv_obj_t* createAppViews(lv_obj_t* parent);
@@ -70,8 +70,6 @@ public:
 
     void onStop(ServiceContext& service) override;
 
-    void requestDraw();
-
     /**
      * Show the on-screen keyboard.
      * @param[in] textarea the textarea to focus the input for