Add help, usage, and version options for woff2_compress + woff2_decompress

[chrissimpkins]

I needed to be able to check the woff2_compress version from the executable.

This PR adds help (--help and -h), usage (--usage), and version (--version and -v) command line options to the woff2_compress and woff2_decompress executables with very minimal command line documentation.

Adds two new header files that contain the string literals. There is likely be a better approach to implement the version strings during the build process. Happy to modify to whatever approach is appropriate/better if there is any interest in supporting these command line options.

Current text:

woff2_compress
Copyright 2013 Google Inc.
MIT License

Include a single *.ttf or *.otf font file path argument to compile to a *.woff2 font file.

Usage: woff2_compress [font file path]

woff2_decompress
Copyright 2013 Google Inc.
MIT License

Include a single *.woff2 font file path argument to decode to a *.ttf font.

Usage: woff2_decompress [font file path]

Usage: woff2_compress [font file path]

Usage: woff2_decompress [font file path]

woff2_decompress v1.0.3

woff2_compress v1.0.3