Fixes and improvements (#132)

- Fix glitch when turning on WiFi: It would temporarily show "No networks found" right before starting the first scan.
- Fix spinner to use Assets.h
- Replace statusbar battery icons 
- Better statusbar icon for when WiFi is on but not connected
- Replace statusbar WiFi icons and Wifi Manage RSSI/lock icons
- Fix for crash when timer is null in I2cScanner
- Deprecate Spacer
- Fixes for toolbar layout (simplified)
- Improved ImageViewer app: center image and add filename text on the bottom
- Add LV debug params to sdkconfig.developer
- Disabled LV spinner, msgbox and window widgets. These have equivalents in Tactility.

Tactility/Source/app/wificonnect/View.cpp

@@ -8,6 +8,7 @@
 #include "service/wifi/WifiSettings.h"
 #include "lvgl/Style.h"
 #include "lvgl/Toolbar.h"
+#include "lvgl/Spinner.h"
 #include <TactilityCore.h>
 #include <cstring>
 
@@ -97,8 +98,7 @@ void View::createBottomButtons(lv_obj_t* parent) {
     lv_obj_align(remember_label, LV_ALIGN_CENTER, 0, 0);
     lv_obj_align_to(remember_label, remember_switch, LV_ALIGN_OUT_RIGHT_MID, 4, 0);
 
-    connecting_spinner = lv_spinner_create(button_container);
-    lv_obj_set_size(connecting_spinner, 32, 32);
+    connecting_spinner = tt::lvgl::spinner_create(button_container);
     lv_obj_align(connecting_spinner, LV_ALIGN_RIGHT_MID, 0, 0);
     lv_obj_add_flag(connecting_spinner, LV_OBJ_FLAG_HIDDEN);