Filesystem improvements and more (#148)

- Rename `assets` and `config` partitions to `system` and `data`
- Change partition type from `spiffs` to `fat`, so we can have sub-directories
- Fix crash when doing WiFi scan: Increased system event task size to 3kB. 
- Free up IRAM on ESP32 (it was required for the Core2, but I also freed up the same amount for Yellow Board)
- Introduced `Paths` objects that can be retrieved by `AppContext` and `ServiceContext`. Apps and services now have their own relative paths. Assets were re-arranged into the correct paths.
- Rename simulator window title to "Tactility"
- Refactored statusbar widget so it persists icon paths properly (it kept a const char* reference, but didn't copy it, so it crashed when the related std::string was destroyed)
- Created `Partitions.h` to expose some useful variables
- Moved USB config in various `sdkconfig`  (it was part of the "default" section, but it shouldn't be)
- Updated domain name

Tactility/Source/app/textviewer/TextViewer.cpp

@@ -24,11 +24,16 @@ static void onShow(AppContext& app, lv_obj_t* parent) {
     lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
     auto parameters = app.getParameters();
     tt_check(parameters != nullptr, "Parameters missing");
+    bool success = false;
     std::string file_argument;
     if (parameters->optString(TEXT_VIEWER_FILE_ARGUMENT, file_argument)) {
         TT_LOG_I(TAG, "Opening %s", file_argument.c_str());
-        lvgl::label_set_text_file(label, file_argument.c_str());
-    } else {
+        if (lvgl::label_set_text_file(label, file_argument.c_str())) {
+            success = true;
+        }
+    }
+
+    if (!success) {
         lv_label_set_text_fmt(label, "Failed to load %s", file_argument.c_str());
     }
 }