Reformat old code using clang-format and add .git-blame-ignore-revs

[mkornaukhov]

• Reformat all files using find . -name '*.cpp' -or -name '*.h' -or -name '*.inl' | xargs clang-format -i from root project directory.
• Add .git-blame-ignore-revs. It's a black list for commits that are not desired.