added column width options

docs/participants.typ

@@ -48,4 +48,20 @@
   custom-image: none,
   show-bottom: true,
   show-top: true,
+) = {}
+
+/// Sets some options for columns between participants
+///
+/// Parameters `p1` and `p2` MUST be consecutive participants (also counting found/lost messages), but they do not need to be in the left to right order
+/// - p1 (str): The first neighbouring participant
+/// - p2 (str): The second neighbouring participant
+/// - width (auto, int, float, length): Optional fixed width of the column\ If the column's content (e.g. sequence comments) is larger, it will overflow
+/// - margin (int, float, length): Additional margin to add to the column\ This margin is not included in `width` and `min-width`, but rather added separately
+/// - min-width (int, float, length): Minimum width of the column\ If set to a larger value than `width`, the latter will be overriden
+#let _col(
+  p1,
+  p2,
+  width: auto,
+  margin: 0,
+  min-width: 0
 ) = {}