Screenshot app & service (#42)

- Added screenshot app & service (PC-only for now)
- Updated docs with screenshots and new device photo
- Add fake statusbar icons for PC/sim build
- added `lv_screenshot` library based on `lv_100ask_screenshot` from https://github.com/100askTeam/lv_lib_100ask
- T-Deck WiFi is now allocated into SPI RAM
- Created `tt_service_find()` to find services by their id

app-sim/src/main.c

@@ -1,7 +1,9 @@
 #include "hello_world/hello_world.h"
 #include "tactility.h"
+#include "assets.h"
 
 #include "FreeRTOS.h"
+#include "ui/statusbar.h"
 
 #define TAG "main"
 
@@ -18,4 +20,9 @@ void app_main() {
     };
 
     tt_init(&config);
+
+    // Note: this is just to test the statusbar as Wi-Fi
+    // and sd card apps are not available for PC
+    tt_statusbar_icon_add(TT_ASSETS_ICON_SDCARD_ALERT);
+    tt_statusbar_icon_add(TT_ASSETS_ICON_WIFI_OFF);
 }