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/Source/service/wifi/WifiApSettings.cpp

@@ -127,6 +127,10 @@ bool load(const std::string& ssid, WifiApSettings& apSettings) {
         return false;
     }
     const auto file_path = getApPropertiesFilePath(service_context->getPaths(), ssid);
+    if (!file::isFile(file_path)) {
+        return false;
+    }
+
     std::map<std::string, std::string> map;
     if (!file::loadPropertiesFile(file_path, map)) {
         return false;