Parkitect Sign creator

Reads signs.txt and creates a set of signs based on the list of OpenClipart
links in that file. It will also parse the list of colours at the top of the
file to create colour variations for each image.


*** Commands

````
Commands:
  ./signs all               # Runs Colorize and Publish
  ./signs colorize          # Downloads all files if not already present and colorizes them
  ./signs download          # Redownloads all files
  ./signs publish           # Creates a montage for all images and zips them

----
Command:
  ./signs all                       # aliases: cp, pc, a

Description:
  Runs Colorize and Publish

Options:
  --[no-]montage                    # Wether to create a montage for each color or not, default: true
  --input=VALUE                     # Input file containing colors and OpenClipart links, default: "signs.txt"
  --[no-]remove-temp                # Remove temp files after zipping them, default: true
  --help, -h                        # Print this help

Examples:
  ./signs all --montage --input=signs.txt --no-remove-temp


----
Command:
  ./signs download                 # aliases: d, -d

Description:
  Redownloads all files

Options:
  --input=VALUE                     # Input file containing colors and OpenClipart links, default: "signs.txt"
  --help, -h                        # Print this help


----
Command:
  ./signs colorize                  # aliases: c, -c

Description:
  Downloads all files if not already present and colorizes them

Options:
  --input=VALUE                     # Input file containing colors and OpenClipart links, default: "signs.txt"
  --help, -h                        # Print this help

Examples:
  ./signs colorize --input=signs.txt


----
Command:
  ./signs publish                  # aliases: p, -p

Description:
  Creates a montage for all images and zips them

Options:
  --[no-]montage                    # Wether to create a montage for each color or not, default: true
  --input=VALUE                     # Input file containing colors and OpenClipart links, default: "signs.txt"
  --[no-]remove-temp                # Remove temp files after zipping them, default: false
  --help, -h                        # Print this help

Examples:
  ./signs publish --montage --input=signs.txt --no-remove-temp
````


*** Signs.txt example.

The below example will download the SVG listed on https://openclipart.org/detail/183445/theme-park
and create two zip files. One containing the image with a white background the
other one with the image with a black background. Adding more openclipart links
will add more files into each zip.


Example (Note the tab characters after image name)
```
White: #FFFFFF
Black: #FFFFFF

Image name		https://openclipart.org/detail/183445/theme-park$
```