[ffigen] Improved generated comments (#16)

closes #16 
- Added comments option to config, Possible options are - {full, brief, none}
- Extracting comments for enum values, struct members
- Wrap brief comments (see `clang_bindings.dart`)
- Removed comment markups from full comments (see `libclang-example/generated_bindings.dart`)
13 files changed
tree: 29ea6e71f4fd969921a4c6892439d0d4b79df786
  1. pkgs/