Added css3 webcolor support for steady colors & random color option

[bwu62]

Added few lines of code in main.py to enable automatic detection of CSS3 webcolors.

Now, instead of sudo msi-perkeyrgb -s 00ff00 you can simply run sudo msi-perkeyrgb -s green or sudo msi-perkeyrgb -s cornflowerblue or sudo msi-perkeyrgb -s peachpuff or whatever other fancy colors you desire.

The changes use the name_to_hex method from the webcolors module (which has been included in the setup.py as a dependency) to try converting the given -s argument from web color to hex. If it fails (e.g. if it's already a hex color), it will revert back to the original behavior and try to set it as a hex color. If that fails, the same original error will be thrown.

Changes have been tested out locally and there appears to be no errors.

[bwu62]

Fixed a minor issue with webcolor code, updated help text, and added random color option.

Color sampled uniformly randomly in HLS space such that

• 25% <= luminance < 75%
• 50% <= saturation < 100%
  so that resulting random color won't be too light or dark or desaturated.

[bwu62]

^ Forgot to add an item to the commit message so amended it and force-pushed.

Changes:

1. Added print out statement to random color feature so user can see the hex color that was randomly generated.
2. Been using this on my computer (GL73-9SDK-413) for few weeks now and I've had no problems, so I added GL73 to the list of supported devices. It seems to use the same keyboard map as GL63.

[bwu62]

Sorry, accidentally hit close button. Request is still open, pending further review or merge.