add root/checkedint.h and .c
COFF support for Win32, use command line option -m32coff
use bool "coff" instead of objfmt in the frontend
use "mscoff" instead of "coff"
fix Issue 13275 - Wrong di header generation on if and foreach statements
document COFF bit in model value
Made it so that the base property and interfaces properties use fully qualified names rather than unresolved names.
Merge pull request #3843 from rainers/coff32

COFF support for Win32
Merge pull request #3867 from Orvid/fullyQualifiedBases

Fix #13277 - Base class in JSON output is always unqualified
Merge pull request #3861 from 9rnsr/fix13275

Issue 13275 - Wrong di header generation on if and foreach statements
Merge pull request #3800 from WalterBright/checkedint

add root/checkedint.h and .c