Implement CSV / TSV import (#45)

- add csv/tsv importer
- add `make_map` script function
- add `alt name` field property
- add `construction script` field property
- add `construction script` game property

doc/function/index.txt

@@ -11,6 +11,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:to_color]]		Convert any value to a [[type:color]]
 | [[fun:to_image]]		Convert any value to an [[type:image]]
 | [[fun:to_date]]		Convert any value to a [[type:date]]
+| [[fun:make_map]]		Create a [[type:map]] from two [[type:list]]s
 | [[fun:type_name]]		Get the type of a value
 	
 ! Numbers			<<<

doc/function/make_map.txt

@@ -0,0 +1,17 @@
+Function: make_map
+
+--Usage--
+> make_map(keys: some_list, values: some_list)
+
+Creates a new map. Converts the elements in keys to strings, and uses them as keys for the elements in values.
+
+Produces a warning if keys and values are not of the same size.
+nil keys will be ignored.
+
+--Parameters--
+! Parameter	Type				Description
+| @keys@	[[type:list]]		List of keys.
+| @values@	[[type:list]]		List of values.
+
+--Examples--
+> make_map(keys:["apple", "durian", 3], values:["good", "bad", "not edible"]) == ["apple":"good", "durian":"bad", "3":"not edible"]

doc/type/field.txt

@@ -28,6 +28,7 @@ Fields are part of the [[file:style triangle]]:
 			* @color@
 			* @info@
 | @name@		[[type:string]]		''required''	Name of the field.
+| @alt names@		[[type:list]] of [[type:string]]		 	Possible alternate names for this field, mainly to look for it when importing CSV files. They are trimmed, made case insensitive, and don't distinguish between spaces and underscores.
 | @description@		[[type:localized string]]		@""@		Description of the field, shown in the status bar when the mouse is over the field.
 | @icon@		[[type:filename]]	 		Filename of an icon for this field, used for automatically generated [[type:statistics category]]s.
 | @editable@		[[type:boolean]]	@true@		Can values of this field be edited?
@@ -42,6 +43,10 @@ Fields are part of the [[file:style triangle]]:
 | @card list name@	[[type:localized string]]		field name	Alternate name to use for the card list, for example an abbreviation.
 | @card list alignment@	[[type:alignment]]	@left@		Alignment of the card list column.
 | @sort script@		[[type:script]]		 		Alternate way to sort the card list when using this column to sort the list.
+| @construction script@		[[type:script]]		 		Script applied to the value given when creating a card with the new_card function.
+			 			 		For example, the pt field should not be initialized directly, since it is a combination of the power field and toughness field.
+			 			 		So if a value is given for pt, it must be redirected to power and toughness like so: {split := split_text(value, match:"/"); [power:split[0], toughness:split[1]]}.
+			 			 		The script must return a map from field names to values. Use the make_map function to dynamically create maps.
 
 The @type@ determines what values of this field contain:
 ! Type			Values contain								Displayed as

doc/type/game.txt

@@ -33,6 +33,7 @@ Such a package contains a [[file:format|data file]] called <tt>game</tt> that ha
 | @default set style@		[[type:indexmap]] of [[type:style]]s	 		Default style for the set fields, can be overridden by the stylesheet.
 | @card fields@			[[type:list]] of [[type:field]]s	 		Fields for each card.
 | @card list color script@	[[type:script]]				from fields	Script that determines the color of an item in the card list. <br/>If not set uses the @card list colors@ property of the first card field that has it.
+| @construction script@		[[type:script]]				 	Script that is applied as the last step in the creation of a card in the new_card function. Must return a map from field names to values. Use the make_map function to dynamically create maps.
 | @statistics dimensions@	[[type:list]] of [[type:statistics dimension]]s		from fields	Dimensions for statistics, a dimension is roughly the same as an axis. <br/>By default all card fields with 'show statistics' set to true are used.
 | @statistics categories@	[[type:list]] of [[type:statistics category]]s		from dimensions	DOC_MSE_VERSION: not used since 0.3.6
 				 					 		Choices shown on the statistics panel. <br/>By default all statistics dimensions are used.