cmake string(HEX) examples

ornladios/ADIOS2 testing/adios2/engine/staging-common/TestSupp.cmake :297 

string(TOUPPER "${HEX}" HEX)

ornladios/ADIOS2 testing/adios2/engine/staging-common/TestSupp.cmake :299 

string(LENGTH "${HEX}" _strlen)

ornladios/ADIOS2 testing/adios2/engine/staging-common/TestSupp.cmake :303 

string(SUBSTRING "${HEX}" 0 1 NIBBLE)

ornladios/ADIOS2 testing/adios2/engine/staging-common/TestSupp.cmake :304 

string(SUBSTRING "${HEX}" 1 -1 HEX)

ornladios/ADIOS2 testing/adios2/engine/staging-common/TestSupp.cmake :321 

string(LENGTH "${HEX}" _strlen)

microsoft/vcpkg scripts/cmake/vcpkg_from_gitlab.cmake :4 

string(HEX "${input}" hex)