add download_image, refactor import_image

doc/function/download_image.txt

@@ -0,0 +1,13 @@
+Function: download_image
+
+--Usage--
+> download_image(image_url)
+
+Load an image from the internet.
+
+--Parameters--
+! Parameter	Type			Description
+| @input@	[[type:string]]		URL of the image to load
+
+--Examples--
+> new_card([image: download_image("https://cards.scryfall.io/art_crop/front/c/6/c634273a-94b0-4104-9d10-ae522ece1fc7.jpg?1755341328"), name: "Adagia, Windswept Bastion"])

doc/function/index.txt

@@ -101,6 +101,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:dimensions_of]]		Get the width and height of an image.
 | [[fun:symbol_variation]]	Render a variation of a [[type:symbol]].
 | [[fun:import_image]]	Load an image from outside the data folder.
+| [[fun:download_image]]	Download an image from a URL.
 | [[fun:built_in_image]]	Return an image built into the program.
 	
 ! Cards				<<<