Create a new python script for updating foreground/background colors

[rohankapoorcom]

Hey @aderusha,

In the same vein as my previous simplifications for updating font size/text (#17, #19), I've also written a python_script to simplify the logic of picking colors. This allows setting the foreground/background color in one service call rather than doing this separately in each automation that needs to do it.

Here's an example:

Before:

    - service: mqtt.publish
      data:
        topic: 'hasp/plate01/command/p[9].b[4].bco'
        payload: '5285'

    - service: mqtt.publish
      data:
        topic: 'hasp/plate01/command/p[9].b[4].pco'
        payload: '65535'

After:

    - service: python_script.hasp_update_colors
      data:
        nodename: plate01
        object_id: 'p[9].b[4]'
        background: '5285'
        foreground: '65535'

I'd recommend merging this in after #19 since it also requires setting up the python_script component and (copying in the scripts) that is demonstrated there. Once that's merged, this will also require a small documentation update and a change to deployhasp.sh to download and grab the new script as well.

[aderusha]

merging into new branch python_script for continued testing