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

Boards/Simulator/Source/LvglTask.cpp

@@ -82,6 +82,7 @@ static void lvgl_task(TT_UNUSED void* arg) {
      * but somehow that doesn't work. Waiting here from a ThreadFlag when that happens
      * also doesn't work. It seems that it must be called from this task. */
     displayHandle = lv_sdl_window_create(320, 240);
+    lv_sdl_window_set_title(displayHandle, "Tactility");
 
     uint32_t task_delay_ms = task_max_sleep_ms;