VS: Add v145 flag tables for VS 18.0 Insiders

Run the commands

    python3 Source/cmConvertMSBuildXMLToJSON.py -t v145 \
        'c:/.../18/Insiders/MSBuild/Microsoft/VC/v180/1033/cl.xml'
    python3 Source/cmConvertMSBuildXMLToJSON.py -t v145 \
        'c:/.../18/Insiders/MSBuild/Microsoft/VC/v180/1033/cl.xml'

To generate `Templates/MSBuild/FlagTables/v143_{CL,Link}.json`.
We can reuse `Templates/MSBuild/FlagTables/v14_LIB.json`.
2 files changed