Use buildSrc to deduplicate build logic (#262)

orx-glslify/build.gradle.kts

@@ -1,5 +1,21 @@
+plugins {
+    org.openrndr.extra.convention.`kotlin-jvm`
+}
+
 dependencies {
+    implementation(libs.openrndr.application)
+    implementation(libs.openrndr.math)
     implementation(libs.gson)
     implementation(libs.jarchivelib)
     implementation(project(":orx-noise"))
+    testImplementation(libs.kluent)
+    testImplementation(libs.spek.dsl)
+    testRuntimeOnly(libs.spek.junit5)
+    testRuntimeOnly(libs.kotlin.reflect)
 }
+
+tasks.test {
+    useJUnitPlatform {
+        includeEngines("spek2")
+    }
+}