PR: Update to FA 5.6.3 and new "update_fa5" setup.py subcommand

[darkvertex]

Hey hey, it's me again! 👋

This upgrades to FontAwesome 5.5.0 but this is an extra special update... ✨

As I'm kind of repeating the same actions over and over when I contribute new FA updates, I explored the idea of creating a setup.py subcommand to do the hard work for me.

Now we can just run:

> python setup.py update_fa5 --fa-version 5.5.0
running update_fa5
Downloading from URL: https://github.com/FortAwesome/Font-Awesome/releases/download/5.5.0/fontawesome-free-5.5.0-web.zip
Dumping updated "brands" charmap: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-brands-webfont-charmap.json
Dumping updated "brands" font: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-brands-webfont.ttf
Dumping updated "solid" charmap: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-solid-webfont-charmap.json
Dumping updated "solid" font: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-solid-webfont.ttf
Dumping updated "regular" charmap: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-regular-webfont-charmap.json
Dumping updated "regular" font: /home/alan/dev/qtawesome/qtawesome/fonts/fontawesome5-regular-webfont.ttf
Patching new MD5 hashes in: /home/alan/dev/qtawesome/qtawesome/iconic_font.py
New "brands" hash is: b69de69a4ff8ca0abe96ec0b0c180c5b
New "solid" hash is: 48f54f63d7711d0912a9a10205538fc4
New "regular" hash is: b48c48ea8457846a5695b139c377d3d1
Dumping updated file: /home/alan/dev/qtawesome/qtawesome/iconic_font.py

Finished!
Please check the git diff to make sure everything went okay.
You should also edit README.md and qtawesome/docs/source/usage.rst to reflect the changes.

Handy! 🎩

[darkvertex]

Looks like my use of urllib2 in setup.py made it unfriendly to Python 3. I'll look into that.

[darkvertex]

All good now. 😅

[darkvertex]

I moved the code to a separate file as per your request and reused my new subcommand to update to FA 5.6.3 which is the latest as of writing this comment.

[ccordoba12]

Thanks a lot for your work on this! Merging and releasing 0.5.4 right away.

[ccordoba12]

0.5.4 is out!

[darkvertex]

Awesome! Thanks for releasing promptly. 👍