Updated kotlin to 1.8.0

Updated kotlin target to java 11
Fixed build errors when targeting 1.8.0

Server/src/main/core/game/bots/CombatBotAssembler.kt

@@ -422,6 +422,7 @@ class CombatBotAssembler {
                 bot.skills.setStaticLevel(Skills.RANGE,1)
                 bot.skills.setStaticLevel(Skills.MAGIC,1)
             }
+            else -> {}
         }
 
         bot.skills.addExperience(Skills.HITPOINTS, (totalXPAdd / skillAmt) * 0.2)

Server/src/main/core/game/node/entity/combat/graves/GraveController.kt

@@ -75,6 +75,7 @@ class GraveController : PersistWorld, TickListener, InteractionListener, Command
 
         when (grave.type) {
             in GraveType.SMALL_GS..GraveType.ANGEL_DEATH -> isGraniteBackground = true
+            else -> {}
         }
 
         if (isGraniteBackground)