Add option for generating batch/ninja file to check clang formatting

Description:

Being able to run clang-format on every modified file would be extremely helpful for KeyWorks projects since most of them use an action to verify that the formatting is correct. Currently, that requires setting up a batch file and ensuring that everything gets added correctly. Since .srcfiles.yaml is usually current with the file list, it would be more reliable if ttBld could either generate the batch file, or even better if it could create a ninja file that could be used to run clang-format on all modified files.