Add reference capability

This adds a new argument, `label`, and makes use of the referencing mechanism of Typst.

documentation.typ

@@ -179,6 +179,20 @@ standard Typst counter functions to control gloss numbering:
     translation: [There always is in us a will for a great happiness.],
 )", addl-bindings: (gloss-count: gloss-count))
 
+References to individual examples can be achieved using the `label` argument and the referencing mechanism of Typst:
+
+#codeblock(
+"See @sorcerers:
+
+#numbered-gloss(
+    header: [Middle Welsh; modified from _Grammatical number in Welsh_ (1999) by Silva Nurmio (§~2.1.1)],
+    source: ([ac], [ny], [allvs], [y], [dewinyon], [atteb], [idav]),
+		morphemes: ([and], [#neg], [be_able.#smallcaps[pret].3#sg], [#smallcaps[def]], [sorcerer.#pl], [answer.#smallcaps[inf]], [to.3#sg.#smallcaps[m]]),
+    translation: [and the sorcerers could not answer him],
+		label: \"sorcerers\",
+)
+
+As we have seen in @sorcerers, […].", addl-bindings: (neg: neg, sg: sg, pl: pl))
 
 == Styling lines of a gloss
 

leipzig-gloss.typ

@@ -1,6 +1,7 @@
 #import "abbreviations.typ"
 
 #let gloss-count = counter("gloss_count")
+#let cmdlabel = label // a workround so we can use `label` as a variable name
 
 #let build_gloss(item-spacing, formatters, gloss_line_lists) = {
     assert(gloss_line_lists.len() > 0, message: "Gloss line lists cannot be empty")
@@ -47,6 +48,7 @@
     additional-lines: (), //List of list of content
     translation: none,
     translation-style: none,
+    label: none,
 
     item-spacing: 1em,
     gloss-padding: 2.0em, //TODO document these
@@ -121,13 +123,18 @@
 
     style(styles => {
         block(breakable: breakable)[
-            #stack(
-            dir:ltr, //TODO this needs to be more flexible
+            #figure(
+                kind: "lingexample",
+                supplement: [Example],
+                numbering: it => [#gloss-count.display()],
+                stack(
+                    dir: ltr, //TODO this needs to be more flexible
                     left_padding,
                     [#gloss_number],
                     gloss-padding - left_padding - measure([#gloss_number],styles).width,
-            [#gloss_items]
-            )
+                    align(left)[#gloss_items],
+                ),
+            ) #if label != none {cmdlabel(label)}
         ]
     }
     )