require clang-format 10.0

[shuffle2]

This is needed to bring *nix clang-format version in sync with the version packaged with VS.
The version parsing had to be changed because (Ubuntu 20.10):

$ clang-format-9 --version
clang-format version 9.0.1-14build1
$ clang-format-10 --version
Ubuntu clang-format version 10.0.1-6
$ clang-format --version
Ubuntu clang-format version 11.0.0-2

I've run clang-format-10 over Source\**\*.cpp and Source\**\*.h.