gr_blocktool: Also known as the block header parsing tool, this tool
              automatically parses any GNU Radio or OOT block header.

Block header tool from the Command Line Interface
=================================================

* Parse any GNU Radio or OOT header file with just the file path as an input.
* Parse a complete header directory with directory-path as the input.
* Get the output in the form of a YAML or a JSON file.
* Add blocktool comments automatically in the header file from the implementation file.


Integration of blocktool with modtool
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* Blocktool API can also be called from modtool.
* Modtool makeyaml subcommand along with -b flag and a
  file path as the input can be used to create YAML files for the GRC.
* YAML output is much better using the blocktool API. 


Use of blocktool as an independent API
======================================

Blocktool can be also be used as an independent API which thus can be used to
parse a block header file during runtime.
* A single mandatory argument block header file path is required.