* Implement a basic YAML based parameter parser for ros2 nodes
* Add README file
* Fix the issues after moving from rcutils_yaml_param_parser to rcl_yaml_param_parser
- rename folders from rcutils_yaml_param_parser to rcl_yaml_param_parser
- rename project, header guards and include statements from rcutils_yaml_param_parser to rcl_yaml_param_parser
- move type declaration in separat file and namespace new structures
- Fix the code review comments from Mikael
* Few minor changes
- Changed "params" string to "ros__parameters"
- Add -Wall, -Wextra and -Wpedantic falgs
- Fix the compile warning with the new flags
* Fix the changes made in the design of C structure
- Remove the node_namespaces entry in rcl_params_t
- Change the type of num_nodes and num_params to size_t
* depend on libyaml_vendor (#236)
* Fix cmake setting standard(C and C++) and add byte_array in C struct
* Remove C11 so that it defaults to C99
* [rcl_yaml_param_parser] fix export symbols (#237)
* add visibility macros
* remove unused macro
* Support for multi level node and parameter name spaces
* Additional fixes and cleanups
- Support for string namespace seperator
- Provide parameter structure init function API
- name cleanups
* off by 1
* Call yaml_parser_delete()
* fclose(yaml_file)
* free() allocated paths
* Call yaml_event_delete()
* completely deallcoate string array
* Few cleanup changes
- Add install command into CMakelists.txt
- Replace one of the zero_allocate with reallocate
- Pass allocator state
- Fix int32_t -> rcl_ret_t return value
* Don't include unistd.h
* Use size_t for array indices
* Just pass the allocator in the init function
