IC:2021-06-01, Merge cFE Fast Tracks

nasa/cFE#1584

Includes:

nasa/cFE#1580, Update ES verify errors to match test
nasa/cFE#1578, Resolve mismatched endforeach of CMakeList.txt
nasa/cFE#1579, Improve event filter documentation
nasa/cFE#1576, EVS/FS documentation cleanup
nasa/cFE#1575, Remove shell file subtype and clarify scope
nasa/cFE#1582, Simplify file open/truncate logic
nasa/cFE#1567, Remove deprecated elements
nasa/cFE#1556, Replace Header Content Type magic number
nasa/cFE#1553, Remove unused EVS LogMode defines
nasa/cFE#1570, Document cleanup from SB/MSG/SBR review, Remove unused CFE_SB_NO_SUBSCRIBERS
nasa/cFE#1565, Add CFE_SB_DestinationD tag and use for pointers
nasa/cFE#1564, Use CFE_MSG_SequenceCount_t for seqcnt type
nasa/cFE#1562, Document CFE_ES_PoolCreateEx NumBlockSizes error handling
nasa/cFE#1560, Documentation cleanup in TBL/TIME
nasa/cFE#1558, Document TblName as app specific