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/wifimanage/View.cpp

@@ -2,7 +2,6 @@
 #include "WifiManage.h"
 
 #include "Log.h"
-#include "Assets.h"
 #include "service/wifi/Wifi.h"
 #include "lvgl/Style.h"
 #include "lvgl/Toolbar.h"
@@ -19,11 +18,11 @@ std::shared_ptr<WifiManage> _Nullable optWifiManage();
 
 const char* getWifiStatusIconForRssi(int rssi) {
     if (rssi >= -60) {
-        return TT_ASSETS_ICON_WIFI_SIGNAL_STRONG_BLACK;
+        return "signal_strong.png";
     } else if (rssi >= -70) {
-        return TT_ASSETS_ICON_WIFI_SIGNAL_MEDIUM_BLACK;
+        return "signal_medium.png";
     } else {
-        return TT_ASSETS_ICON_WIFI_SIGNAL_WEAK_BLACK;
+        return "signal_weak.png";
     }
 }
 
@@ -111,13 +110,15 @@ void View::createSsidListItem(const service::wifi::WifiApRecord& record, bool is
         lv_obj_align_to(connecting_spinner, info_wrapper, LV_ALIGN_OUT_LEFT_MID, -8, 0);
     } else {
         const char* icon = getWifiStatusIconForRssi(record.rssi);
+        auto icon_path = paths->getSystemPathLvgl(icon);
         lv_obj_t* rssi_image = lv_image_create(wrapper);
-        lv_image_set_src(rssi_image, icon);
+        lv_image_set_src(rssi_image, icon_path.c_str());
         lv_obj_align(rssi_image, LV_ALIGN_RIGHT_MID, -42, 0);
 
         if (record.auth_mode != WIFI_AUTH_OPEN) {
             lv_obj_t* lock_image = lv_image_create(wrapper);
-            lv_image_set_src(lock_image, TT_ASSETS_ICON_WIFI_LOCK_BLACK);
+            auto lock = paths->getSystemPathLvgl("lock.png");
+            lv_image_set_src(lock_image, lock.c_str());
             lv_obj_align(lock_image, LV_ALIGN_RIGHT_MID, -62, 0);
         }
     }
@@ -232,6 +233,8 @@ void View::updateEnableOnBootToggle() {
 void View::init(const AppContext& app, lv_obj_t* parent) {
     root = parent;
 
+    paths = std::move(app.getPaths());
+
     // Toolbar
     lv_obj_set_flex_flow(parent, LV_FLEX_FLOW_COLUMN);
     lv_obj_t* toolbar = lvgl::toolbar_create(parent, app);