When cleaning up a task the child task resources should be
cleaned first, followed by the main task resources.

This is because child tasks are also associated with the original
creator within OSAL and will be found through OSAL ForEachObject,
and also via links within the ES task table.

By cleaning child tasks first, this avoids attempting to delete
the child task twice.

Resolve remaining alignment warnings in the unit test and stub code.
In es_UT.c test cases were passing a char* as a stack pointer (uint32*)
Memory pool code was also using uint8[] buffer as uint32.
Most casting becomes unnecessary when defined as the correct type.

Add missing UT_Stub_RegisterContext to CFE_EVS_SendEvent and CFE_ES_WriteToSysLog.
This will create the correct register buffer size.

Changes Message Key from uint16 to uint32 to avoid rollover

Fix #681, Resolve doxygen warnings for tbl

Fix #309, Typo in CFE_ES_RestartApp WriteToSysLog

Fix #684, order of CleanupTaskResources

Fix #687, validate table handle prior to use

Fix #693, Utilize UT macros in sb_UT

Fix #657, Add UT_Stub_RegisterContext to CFE_EVS_SendEvent and CFE_ES_WriteToSysLog

Fix #707, Resolve highest MsgID of 0xFFFF bug

Fix #679, Alignment warnings in unit test