Feature/clang format

[zepinto]

• Added .clang-format that can be used directly from most IDEs (https://github.com/andrewseidl/githook-clang-format).
• Also added a script under programs/scripts that will apply this format to any locally commited source files (can be also be used as a git pre-commit hook).
• CMakeLists also has targets to reformat the entire source (if ever this will be needed).