Custom templating engine

[laggron42]

This PR will rework the card generation algorithm to allow any kind of custom template on individual regimes and special events.

A new YAML config file will be introduced in the following provisional format:

default:
  canvas: 1500x2000

  background:
    type: image
    size: fill  # base canvas size
    path: "{{ background }}"

  art:
    type: image
    position: 700x261  # top left coordinate
    size: 1359x731  # size rectangle to fit the image in
    path: ".{{ ball.collection_card }}"

  icon:
    type: image
    position: 1200x300
    size: 192x192
    path: "{{ '.'+ball.economy.icon if ball.economy.icon else '' }}"

  description:
    type: text
    position: 50x20
    text: Hi this is a test
    font: mangati.ttf
    size: 80  # text size
    color: "#44FF00FF"  # text color
    stroke:  # text stroke (color+width)
      width: 5
      color: "#FF44FFFF"
    #wrap_width: 32  # width of the text box (wrap new lines)
    align: left  # left/right/middle alignment on position
    spacing: 20  # size between lines if multiline
    #anchor: ms  # where to attach the text base line, used for positioning
    direction: ttb  # right-to-left, left-to-right or top-to-bottom

special_event:  # create an override
  inherit: default
  background:
    # only change the background
    path: something_cool.png

Jinja2 templating substitution will be supported to allow a lot of extra stuff.

This implies the removal of the special "shiny" status, which will be automatically replaced by an unlimited special event.

Resolves #435, resolves #5, resolves #17