Oursource task_fans and task_buzzer

- outsource task_fans and task_buzzer from main.cpp to their source files
- use task parameters to pass necessary configs and objects
- adjust task priorities (display was too low)

common/buzzer.cpp

@@ -2,6 +2,19 @@
 
 static const char *TAG_BUZZER = "buzzer";
 
+//======================================
+//============ buzzer task =============
+//======================================
+// Task that repeatedly handles the buzzer object (process Queued beeps)
+void task_buzzer(void * param_buzzerObject){
+    ESP_LOGI("task_buzzer", "Start of buzzer task...");
+    buzzer_t * buzzer = (buzzer_t *)param_buzzerObject;
+        //run function that waits for a beep events to arrive in the queue
+        //and processes them
+        buzzer->processQueue();
+}
+
+
 //============================
 //========== init ============
 //============================

common/buzzer.hpp

@@ -53,4 +53,9 @@ class buzzer_t {
 };
 
 
-
+//======================================
+//============ buzzer task =============
+//======================================
+// Task that repeatedly handles the buzzer object (process Queued beeps)
+// Note: pointer to globally initialized buzzer object has to be passed as task-parameter
+void task_buzzer(void * param_buzzerObject);

common/motorctl.cpp

@@ -19,7 +19,7 @@ void task_motorctl( void * task_motorctl_parameters ){
     while(1){
     	objects->motorRight->handle();
     	objects->motorLeft->handle();
-        vTaskDelay(10 / portTICK_PERIOD_MS);
+        vTaskDelay(15 / portTICK_PERIOD_MS);
     }
 }
 

common/types.hpp

@@ -12,6 +12,7 @@ extern "C"
 //====== struct/type  declarations ======
 //=======================================
 //global structs and types that need to be available for all boards
+//this file is necessary to prevent dependency loop between motordrivers.hpp and motorctl.hpp since 
 
 
 //===============================