Predefined objects and :draw action

[Sov-trotter]

PR Checklist

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• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
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Link to relevant issue(s)
Closes #218 #313

How did you address these issues with this PR? What methods did you use?
This implements the appear{:draw} method and predefines the (args...) -> ... declaration for some basic shapes.
The medata implementation here is temporary as I store everything in a Dict in the object.result field.

TEST SCRIPT: https://gist.github.com/Sov-trotter/2df6181fd2ca2d2f121ecd7be490c2aa

[Sov-trotter]

I have been thinking of having :draw action for a bunch of basic shapes. Obviously the methods for each differ quite alot.
What other basic shapes can we include @TheCedarPrince @Wikunia both for :draw and object declarations?

[Wikunia]

The idea was to be able to use this for all polygons such that the user can write something like the space filling curve in #218 by simply using line functions inside a user defined function.

[Sov-trotter]

There are a few things here:

• The current way of drawing lines and circles is quite hacky. For a line I have just drawn it from point to point(using the get_interpolation) method.
• For a circle, I have created a clipping mask using a pi and increased it's angle according to the interpolation factor.
• Now we can go on creating drawing actions for different shapes. But what we really want to do it beable to do that for any polygon for that matter. https://juliagraphics.github.io/Luxor.jl/stable/polygons/#Luxor.polyportion is what we need to look at and bridge it with the interpolation factor. To get increasing portions of any polygon iteratively
• Also the predefined objects(shorthands.jl) can be removed since they will be a part of a separate PR