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/service/loader/Loader.cpp

@@ -243,7 +243,7 @@ static void stopAppInternal() {
         return;
     }
 
-    std::unique_ptr<app::ResultHolder> result_holder = std::move(app_to_stop->getResult());
+    auto result_holder = std::move(app_to_stop->getResult());
 
     const app::AppManifest& manifest = app_to_stop->getManifest();
     transitionAppToState(*app_to_stop, app::StateHiding);