Introduce InfoPanel.

InfoPanels are information displays that do not cost actions. One of them (the Prompt) is shown at the main menu; others can be made available as options in the menu, ether on an ongoing basis or for the current/next turn only.

cardsim/player.go

@@ -4,16 +4,19 @@ import "math/rand"
 
 // Player stores all gameplay state for one player.
 type Player[C StatsCollection] struct {
-	Stats            C
-	Name             string
-	Deck             *Deck[C]
-	Hand             []Card[C]
-	HandLimit        int
-	ActionsPerTurn   int
-	ActionsRemaining int
-	PermanentActions []Card[C]
-	Rules            *RuleCollection[C]
-	Rand             rand.Rand
-	Turn             int
-	PendingMessages  []Message
+	Stats             C
+	Name              string
+	Deck              *Deck[C]
+	Hand              []Card[C]
+	HandLimit         int
+	ActionsPerTurn    int
+	ActionsRemaining  int
+	PermanentActions  []Card[C]
+	InfoPanels        []InfoPanel[C]
+	Prompt            InfoPanel[C]
+	Rules             *RuleCollection[C]
+	Rand              rand.Rand
+	Turn              int
+	TemporaryMessages []Message
+	TemporaryPanels   []InfoPanel[C]
 }