Use buildSrc to deduplicate build logic (#262)

orx-jvm/orx-panel/build.gradle.kts

@@ -1,27 +1,33 @@
 import ScreenshotsHelper.collectScreenshots
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    org.openrndr.extra.convention.`kotlin-jvm`
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.freeCompilerArgs = listOf("-opt-in=kotlin.RequiresOptIn")
+}
+
+tasks.test {
+    useJUnitPlatform {
+        includeEngines("spek2")
+    }
+}
 
 sourceSets {
-    val main by getting { }
-    val demo by creating {
-        java {
-            srcDir("src/demo/kotlin")
-            compileClasspath += main.getCompileClasspath()
-            runtimeClasspath += main.getRuntimeClasspath()
-        }
-    }
+    val demo by getting
     collectScreenshots(project, demo) { }
 }
 
-val demoImplementation by configurations.getting {}
-
-val demoRuntimeOnly by configurations.getting {}
-
 dependencies {
+    implementation(libs.openrndr.application)
+    implementation(libs.openrndr.math)
+    implementation(libs.kotlin.coroutines)
     implementation(libs.kotlin.reflect)
-    demoImplementation(libs.openrndr.extensions)
+    testImplementation(libs.spek.dsl)
+    testRuntimeOnly(libs.spek.junit5)
+    testRuntimeOnly(libs.kotlin.reflect)
     demoImplementation(libs.openrndr.dialogs)
     demoImplementation(libs.gson)
-    demoRuntimeOnly(libs.openrndr.gl3.core)
-    demoRuntimeOnly(libs.openrndr.gl3.natives)
-    demoImplementation(sourceSets.getByName("main").output)
-}
+}