- change OSAL_TASK_FUNCTION to have void* parameter (to be consistent with most popular RTOS)

- add new error enum TUSB_ERROR_OSAL_TASK_CREATE_FAILED
- move usbh_enumeration_task prototype to usbh.h
- change OSAL_SUBTASK_INVOKED_AND_WAIT behavior, will not "return" in calling task when subtask got error status.
calling task need to do that after the call
- osal_queue_receive signature from uint32_t* to void*

- implement osal_freertos.h for FreeRTOS 7.3 --> able to compile & build host_freertos
+ OSAL_TASK_FUNCTION
+ turn on FPU for M4 in both host_os_none & host_freertos (freertos requires FPU to be on to compile)
+ osal_task_create
+ OSAL_SUBTASK_INVOKED_AND_WAIT
+ SUBTASK_ASSERT
+ osal_semaphore_reset
+ osal_queue_flush
+ adding heap_1.c for memory management

demos/bsp/boards/board.c

@@ -42,7 +42,9 @@ volatile uint32_t system_ticks = 0;
 void SysTick_Handler (void)
 {
   system_ticks++;
+#if TUSB_CFG_OS == TUSB_OS_NONE
   tusb_tick_tock(); // TODO temporarily
+#endif
 }
 
 void check_failed(uint8_t *file, uint32_t line)