Merge branch 'ps/doc-more-c-coding-guidelines'

Some project conventions have been added to CodingGuidelines. * ps/doc-more-c-coding-guidelines: Documentation: consistently use spaces inside initializers Documentation: document idiomatic function names Documentation: document naming schema for structs and their functions Documentation: clarify indentation style for C preprocessor directives clang-format: fix indentation width for preprocessor directives