Implement unique IDs and card linking

doc/function/index.txt

@@ -97,6 +97,8 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:flip_vertical]]		Flip an image vertically.
 | [[fun:rotate_image]]		Rotate an image.
 | [[fun:drop_shadow]]		Add a drop shadow to an image.
+| [[fun:insert_image]]		Insert an image inside another.
+| [[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:built_in_image]]	Return an image built into the program.
@@ -106,6 +108,9 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:add_card_to_set]]		Add a [[type:card]] to a [[type:set]].
 | [[fun:get_card_styling]]		Get the styling data of a [[type:card]].
 | [[fun:get_card_stylesheet]]	Get the stylesheet of a [[type:card]].
+| [[fun:get_card_from_uid]]		Find the [[type:card]] with the given uid.
+| [[fun:get_card_from_link]]		Find a [[type:card]] that has the given link type to the given [[type:card]].
+| [[fun:has_link]]		Determine if the given the given [[type:card]] has a link of the given type.
 	
 ! HTML export			<<<
 | [[fun:to_html]]		Convert [[type:tagged text]] to html.
@@ -118,6 +123,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 	
 ! Other functions		<<<
 | [[fun:get_mse_version]]			Get the MSE app version.
+| [[fun:get_mse_locale]]			Get the name of the currently selected locale.
 | [[fun:get_mse_path]]			Get the MSE app folder absolute path.
 | [[fun:trace]]			Output a message for debugging purposes.
 | [[fun:assert]]		Check a condition for debugging purposes.