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/lvgl/Statusbar.h

@@ -10,9 +10,10 @@ namespace tt::lvgl {
 #define STATUSBAR_HEIGHT (STATUSBAR_ICON_SIZE + 4) // 4 extra pixels for border and outline
 
 lv_obj_t* statusbar_create(lv_obj_t* parent);
-int8_t statusbar_icon_add(const char* _Nullable image);
+int8_t statusbar_icon_add(const std::string& image);
+int8_t statusbar_icon_add();
 void statusbar_icon_remove(int8_t id);
-void statusbar_icon_set_image(int8_t id, const char* image);
+void statusbar_icon_set_image(int8_t id, const std::string& image);
 void statusbar_icon_set_visibility(int8_t id, bool visible);
 
 } // namespace