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

TactilityHeadless/Source/TactilityHeadlessEsp.cpp

@@ -0,0 +1,38 @@
+#ifdef ESP_TARGET
+#include "TactilityCore.h"
+#include "EspPartitions_i.h"
+
+#include "esp_event.h"
+#include "esp_netif.h"
+#include "nvs_flash.h"
+
+namespace tt {
+
+#define TAG "tactility"
+
+// Initialize NVS
+static void initNvs() {
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        TT_LOG_I(TAG, "nvs erasing");
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    TT_LOG_I(TAG, "nvs initialized");
+}
+
+static void initNetwork() {
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+}
+
+void initEsp() {
+    initNvs();
+    initPartitionsEsp();
+    initNetwork();
+}
+
+} // namespace
+
+#endif