✨ Convert build scripts to Kotlin

Also added some new tasks to only build/install to maven local certain platforms
`buildMinecraft`, `installMinecraft`, `buildDiscord`, `installDiscord`, `buildIRC`, `installIRC`

examples/example-velocity/build.gradle

@@ -1,17 +0,0 @@
-apply plugin: "com.github.johnrengelman.shadow"
-
-shadowJar {
-    dependencies {
-        exclude(dependency('com.velocitypowered:velocity-api'))
-    }
-}
-
-build.dependsOn(shadowJar)
-
-dependencies {
-    api project(':cloud-velocity')
-    api project(':cloud-minecraft-extras')
-    api project(':cloud-annotations')
-    compileOnly('com.velocitypowered:velocity-api:1.1.0')
-    annotationProcessor('com.velocitypowered:velocity-api:1.1.0')
-}

examples/example-velocity/build.gradle.kts

@@ -0,0 +1,22 @@
+plugins {
+    id ("com.github.johnrengelman.shadow")
+}
+
+tasks {
+    shadowJar {
+        dependencies {
+            exclude(dependency("com.velocitypowered:velocity-api"))
+        }
+    }
+    build {
+        dependsOn(shadowJar)
+    }
+}
+
+dependencies {
+    api(project(":cloud-velocity"))
+    api(project(":cloud-minecraft-extras"))
+    api(project(":cloud-annotations"))
+    compileOnly("com.velocitypowered:velocity-api:1.1.0")
+    annotationProcessor("com.velocitypowered:velocity-api:1.1.0")
+}