Upgrade to Gradle 8.10, Kotlin 2.0.20, reduce warnings

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

@@ -5,7 +5,9 @@ plugins {
 }
 
 tasks.withType<KotlinCompile> {
-    kotlinOptions.freeCompilerArgs = listOf("-opt-in=kotlin.RequiresOptIn")
+    compilerOptions {
+        freeCompilerArgs.add("-opt-in=kotlin.RequiresOptIn")
+    }
 }
 
 tasks.test {

orx-jvm/orx-panel/src/main/kotlin/org/openrndr/panel/elements/LayoutBuilder.kt

@@ -88,7 +88,7 @@ fun Element.div(vararg classes: String, init: Div.() -> Unit): Div {
 }
 
 inline fun <reified T : TextElement> Element.textElement(classes: Array<out String>, init: T.() -> String): T {
-    val te = T::class.java.newInstance()
+    @Suppress("DEPRECATION") val te = T::class.java.newInstance()
     te.classes.addAll(classes.map { ElementClass(it) })
     te.text(te.init())
     append(te)

orx-jvm/orx-panel/src/main/kotlin/org/openrndr/panel/hash/WatchHash.kt

@@ -7,7 +7,7 @@ import kotlin.reflect.full.declaredMemberProperties
 fun watchHash(toHash: Any): Int {
     var hash = 0
     for (property in toHash::class.declaredMemberProperties) {
-        val v = ((property as KProperty1<Any, Any?>).getter).invoke(toHash)
+        @Suppress("UNCHECKED_CAST") val v = ((property as KProperty1<Any, Any?>).getter).invoke(toHash)
         if (v is KProperty0<*>) {
             val pv = v.get()
             hash = 31 * hash + (pv?.hashCode() ?: 0)