Combine initialized and shutdown flags into one

[jphickey]

Is your feature request related to a problem? Please describe.
The OSAL global state structure has two flags, one for "initialized" (set during OS_API_Init) and one for shutdown (set during OS_ApplicationShutdown). Although similar in purpose, they are defined and work differently.

Describe the solution you'd like
Should combine these into just one state variable, which should be 0 prior to initialization (i.e. such that the application loader provided by the OS will zero it before OSAL loads), then set to a nonzero value for normal runtime, and another special nonzero value for shutdown.

Additional context
Just a suggestion for cleaning up/simplifying what is already there...

Structure defined here:

osal/src/os/shared/inc/os-shared-common.h

Lines 40 to 67 in 9407cdf

	struct OS_shared_global_vars
	{
	bool Initialized;
	/*
	* The console device ID used for OS_printf() calls
	*/
	osal_id_t PrintfConsoleId;
	/*
	* PrintfEnabled and ShutdownFlag are marked "volatile"
	* because they are updated and read by different threads
	*/
	volatile bool PrintfEnabled;
	volatile uint32 ShutdownFlag;
	uint32 MicroSecPerTick;
	uint32 TicksPerSecond;
	/*
	* The event handler is an application-defined callback
	* that gets invoked as resources are created/configured/deleted.
	*/
	OS_EventHandler_t EventHandler;
	#ifdef OSAL_CONFIG_DEBUG_PRINTF
	uint8 DebugLevel;
	#endif
	};

.

Using a full 32 bit value with all bits - even though there are only a few states - provides protection in case of a random bit flip. At least in the case of an application shutdown, the entire system operation shouldn't be dependent on a single bit in memory. This is why the current "shutdown flag" is not just a simple 0/1. So this should be preserved, but it should be trivial to combine this with the "Initialized" field.

Requester Info
Joseph Hickey, Vantage Systems, Inc.