combat: add hit chance & damage variance to make combat more engaging

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ia1e0a503dba03e5df7b863b97db962e36a6a6964

src/combat.h

@@ -12,10 +12,13 @@ int combat_get_last_damage(void);
 // Was last damage to player?
 int combat_was_player_damage(void);
 
+// Was it a critical hit?
+int combat_was_critical(void);
+
 // Reset combat event
 void combat_reset_event(void);
 
-// Player attacks enemy
+// Player attacks enemy (pass player for damage variance)
 void combat_player_attack(Player *p, Enemy *e);
 
 // Enemy attacks player