12 devx setup development environment

[gwolf-011235]

Add some files for project setup

dev container

• Adds devcontainer.json and associated Dockerfile which can be used with VS Code extension "Dev Containers".
• Container is based on the C++ development example.
• Added dependencies:
  • clang-format: formatting
  • clang-tidy: static analysis of code
  • cppcheck: also static analysis
  • doxygen: generate documentation out of doxygen comments
  • libgtest-dev: package of google test
  • clangd: language server as alternative to IntelliSense
  • bear: used to create compile_commands.json
• Setup google test by building library (not automatically done by package)

clang-format

• Adds .clang-format file which standardizes formatting
• Based on WebKit style
• Special config at end of file:
  • ColumnLimit: 120 (Standard: 0). If Limit is at 0 formatting of comments does not work properly
  • TabWidth: 4 (Standard: 8). Seems to be more familiar, 8 is too much
  • UseTab: Always (Standard: Never). Use tabs instead of spaces. We discussed it and agreed that tabs are more modern than spaces
• Can be used by executable clang-format to format single files
• VSCode can also be set up to use it > Open Settings (UI) > search for Formatting > Under C/C++ configure

clang-tidy

• Adds clang-tidy file which enables checks used for static analysis
• Enables all checks, then disables project specific one, and some not possible ones (eg C11 features)
• Also adds little configs for readability checks. E.g member variables have to use m_
• At the end comment describing why checks are disabled (inline comments are not yet supported by our clang-tidy version)

various

• Add .cache/ (produced by clangd) and compile_commands.json (used by clangd) to gitignore

Closes #12