Various improvements (#21)

* T-Deck stability and naming improvements

* allow main task to clean itself up

* remove unused includes

* various lvgl improvements

* added docs

app-sim/src/freertos.c

@@ -1,45 +1,31 @@
 #include "tactility.h"
+#include "thread.h"
 
 #include "FreeRTOS.h"
 #include "task.h"
 
 #define TAG "freertos"
 
-#define mainQUEUE_RECEIVE_TASK_PRIORITY (tskIDLE_PRIORITY + 2)
-
-_Noreturn void app_main();
-
-bool lvgl_is_ready();
-void lvgl_task(void*);
-
-void app_main_task(TT_UNUSED void* parameter) {
-    while (!lvgl_is_ready()) {
-        TT_LOG_I(TAG, "waiting for lvgl task");
-        vTaskDelay(50);
-    }
+void app_main();
 
+static void main_task(TT_UNUSED void* parameter) {
+    TT_LOG_I(TAG, "starting app_main()");
     app_main();
+    TT_LOG_I(TAG, "returned from app_main()");
+    vTaskDelete(NULL);
 }
 
 int main() {
-    // Create the main app loop, like ESP-IDF
-    xTaskCreate(
-        lvgl_task,
-        "lvgl",
+    BaseType_t task_result = xTaskCreate(
+        main_task,
+        "main",
         8192,
         NULL,
-        mainQUEUE_RECEIVE_TASK_PRIORITY + 2,
+        ThreadPriorityNormal,
         NULL
     );
 
-    xTaskCreate(
-        app_main_task,
-        "app_main",
-        8192,
-        NULL,
-        mainQUEUE_RECEIVE_TASK_PRIORITY + 1,
-        NULL
-    );
+    tt_assert(task_result == pdTRUE);
 
     // Blocks forever
     vTaskStartScheduler();
@@ -49,11 +35,11 @@ int main() {
  * Assert implementation as defined in the FreeRTOSConfig.h
  * It allows you to set breakpoints and debug asserts.
  */
-void vAssertCalled(TT_UNUSED unsigned long line, TT_UNUSED const char* const file) {
+void vAssertCalled(unsigned long line, const char* const file) {
     static portBASE_TYPE xPrinted = pdFALSE;
     volatile uint32_t set_to_nonzero_in_debugger_to_continue = 0;
 
-    TT_LOG_E(TAG, "assert triggered");
+    TT_LOG_E(TAG, "assert triggered at %s:%d", file, line);
     taskENTER_CRITICAL();
     {
         // Step out by attaching a debugger and setting set_to_nonzero_in_debugger_to_continue