Implement more entities

[EriKWDev]

Implement More Entities!

We want more entities to play around with :) We also need to implement raster-entities...

• => done
• => needs to be implemented

Vector Entities

• Text
• Arc
• Circle
• SVG Images (from file-location or text)
• Rectangle
• Square
• Line
• Triangle
• Regular polygons
• Rounded variants of all of the above (or just a corner_radius property on all vector entities)

Raster Entities

• Raster variants of vector entities (feasable? Perhaps through a vector_entity_to_raster that renders them to a surface and turns that surface into a pixel-array)
• PNG/JPEG/GIF Images
• ColorFromFunction (Apply a function of some sort to every pixel within an area and turn the coordinates into a color of some sort)
• BackgroundFromFunction (Extends the ColorFromFunction entity but supplies screen width and height by default...)