Update to Kotlin 1.60 and Gradle 4.9

Removes the dependency on legacy script compilation and now relies on script
discovery.  In addition, the Gradle build scripts were refactored and updated
to be compatible with Gradle 5.0 and make use of the new java-library
configurations.

game/plugin/build.gradle

@@ -1,14 +1,5 @@
-buildscript {
-    repositories {
-        jcenter()
-        mavenCentral()
-
-        maven { url "https://plugins.gradle.org/m2/" }
-    }
-
-    dependencies {
-        classpath "gradle.plugin.io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.0.0.RC4-3"
-    }
+plugins {
+    id "io.gitlab.arturbosch.detekt" version "1.0.0.RC8" apply(false)
 }
 
 def detektConfig = "${project.projectDir}/detekt.yml"
@@ -18,33 +9,15 @@ subprojects { subproj ->
         apply plugin: 'apollo-plugin'
         apply plugin: 'io.gitlab.arturbosch.detekt'
 
-        buildscript {
-            repositories {
-                jcenter()
-                mavenCentral()
-
-                maven { url "https://plugins.gradle.org/m2/" }
-            }
-
-            dependencies {
-                classpath "gradle.plugin.io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.0.0.RC4-3"
-            }
-        }
-
-        repositories {
-            mavenCentral()
-            maven {
-                url { 'https://dl.bintray.com/kotlin/kotlinx/' }
-            }
-        }
-
         detekt {
-            version = "1.0.0.RC4-3"
-
             profile("main") {
                 input = "${subproj.projectDir}/src"
                 config = detektConfig
             }
         }
+
+        dependencies {
+            implementation group: 'com.google.guava', name: 'guava', version: guavaVersion
+        }
     }
 }

game/plugin/skills/fishing/src/spots.plugin.kts

@@ -1,12 +1,10 @@
+
 import org.apollo.game.model.Direction
 import org.apollo.game.model.Position
 import org.apollo.game.plugin.entity.spawn.Spawn
 import org.apollo.game.plugin.entity.spawn.Spawns
 import org.apollo.game.plugin.skills.fishing.FishingSpot
-import org.apollo.game.plugin.skills.fishing.FishingSpot.CAGE_HARPOON
-import org.apollo.game.plugin.skills.fishing.FishingSpot.NET_HARPOON
-import org.apollo.game.plugin.skills.fishing.FishingSpot.NET_ROD
-import org.apollo.game.plugin.skills.fishing.FishingSpot.ROD
+import org.apollo.game.plugin.skills.fishing.FishingSpot.*
 
 // Al-Kharid
 register(NET_ROD, x = 3267, y = 3148)