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.

TactilityC/Source/TactilityC/TactilityC.cpp

@@ -1,5 +1,3 @@
-extern "C" {
-
 #ifdef ESP_PLATFORM
 
 #include "elf_symbol.h"
@@ -7,15 +5,20 @@ extern "C" {
 #include "app/App.h"
 #include "app/SelectionDialog.h"
 #include "lvgl/Toolbar.h"
+#include "TactilityC/lvgl/Spinner.h"
 
 #include "lvgl.h"
 
+extern "C" {
+
 const struct esp_elfsym elf_symbols[] {
     // Tactility
     ESP_ELFSYM_EXPORT(tt_app_selectiondialog_start),
     ESP_ELFSYM_EXPORT(tt_set_app_manifest),
     ESP_ELFSYM_EXPORT(tt_lvgl_toolbar_create),
     ESP_ELFSYM_EXPORT(tt_lvgl_toolbar_create_simple),
+    // tt::lvgl
+    ESP_ELFSYM_EXPORT(tt_lvgl_spinner_create),
     // lv_obj
     ESP_ELFSYM_EXPORT(lv_obj_add_event_cb),
     ESP_ELFSYM_EXPORT(lv_obj_align),
@@ -113,9 +116,6 @@ const struct esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(lv_list_add_button),
     ESP_ELFSYM_EXPORT(lv_list_get_button_text),
     ESP_ELFSYM_EXPORT(lv_list_set_button_text),
-    // lv_spinner
-    ESP_ELFSYM_EXPORT(lv_spinner_create),
-    ESP_ELFSYM_EXPORT(lv_spinner_set_anim_params),
     // lv_textarea
     ESP_ELFSYM_EXPORT(lv_textarea_create),
     ESP_ELFSYM_EXPORT(lv_textarea_get_accepted_chars),
@@ -139,11 +139,15 @@ void tt_init_tactility_c() {
     elf_set_custom_symbols(elf_symbols);
 }
 
+}
+
 #else // Simulator
 
+extern "C" {
+
 void tt_init_tactility_c() {
 }
 
-#endif // ESP_PLATFORM
-
 }
+
+#endif // ESP_PLATFORM

TactilityC/Source/TactilityC/lvgl/Spinner.cpp

@@ -0,0 +1,10 @@
+#include "Spinner.h"
+#include "lvgl/Spinner.h"
+
+extern "C" {
+
+lv_obj_t* tt_lvgl_spinner_create(lv_obj_t* parent) {
+    return tt::lvgl::spinner_create(parent);
+}
+
+}

TactilityC/Source/TactilityC/lvgl/Spinner.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "lvgl.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+lv_obj_t* tt_lvgl_spinner_create(lv_obj_t* parent);
+
+#ifdef __cplusplus
+}
+#endif