Statusbar improvements (#36)

- Added sdcard service: it updates a statusbar icon and it can auto-unmount sdcards that were physically ejected by the user.
- Added `is_mounted` check for sdcard drivers
- Refactored assets: moved them from `tactility-esp/` to `data/`
- Made assets work with sim build
- Refactored wifi statusbar icons
- Refactored wifi_manage app access point icons
- Support not having an initial image icon when registering a new icon in statusbars. When a statusbar icon is added, it is now visible/invisible depending on whether an image was specified.
- Keep track of app memory on app start to find memory leaks (needs fine-tuning in the future)
- `tt_init()` assigns `config_instance` earlier, so it can be used during service init

tactility-core/src/pubsub.c

@@ -13,7 +13,7 @@ LIST_DEF(PubSubSubscriptionList, PubSubSubscription, M_POD_OPLIST);
 
 struct PubSub {
     PubSubSubscriptionList_t items;
-    Mutex* mutex;
+    Mutex mutex;
 };
 
 PubSub* tt_pubsub_alloc() {

tactility-core/src/thread.c

@@ -80,7 +80,6 @@ static void tt_thread_body(void* context) {
     tt_thread_set_state(thread, ThreadStateRunning);
 
     thread->ret = thread->callback(thread->context);
-    TT_LOG_I(TAG, "thread returned: %s", thread->name ?: "[no name]");
 
     tt_assert(thread->state == ThreadStateRunning);
 
@@ -170,7 +169,7 @@ void tt_thread_mark_as_static(Thread* thread) {
     thread->is_static = true;
 }
 
-bool tt_thread_mark_is_service(ThreadId thread_id) {
+bool tt_thread_mark_is_static(ThreadId thread_id) {
     TaskHandle_t hTask = (TaskHandle_t)thread_id;
     assert(!TT_IS_IRQ_MODE() && (hTask != NULL));
     Thread* thread = (Thread*)pvTaskGetThreadLocalStoragePointer(hTask, 0);

tactility-core/src/thread.h

@@ -275,7 +275,12 @@ void tt_thread_resume(ThreadId thread_id);
  */
 bool tt_thread_is_suspended(ThreadId thread_id);
 
-bool tt_thread_mark_is_service(ThreadId thread_id);
+/** Check if the thread was created with static memory
+ *
+ * @param thread_id  thread id
+ * @return true if thread memory is static
+ */
+bool tt_thread_mark_is_static(ThreadId thread_id);
 
 #ifdef __cplusplus
 }