Restructure project

* use modules instead of source sets
* Kotlin JVM instead of multiplatform (for now) to make things simpler
* Warning: GameCell doesn't use mutableState anymore, this needs to be
           fixed for the UI to work!

desktop/build.gradle.kts

@@ -0,0 +1,42 @@
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.jetbrainsKotlinCompose)
+    alias(libs.plugins.jetbrainsCompose)
+}
+
+kotlin {
+    jvmToolchain(11)
+
+    dependencies {
+        implementation(compose.desktop.currentOs)
+        implementation(compose.material3)
+        implementation(compose.components.resources)
+        implementation(projects.commonUI)
+        implementation(compose.components.uiToolingPreview)
+
+        testImplementation(libs.kotlin.test)
+        testImplementation(libs.atrium)
+        testImplementation(compose.desktop.uiTestJUnit4)
+        testImplementation(compose.desktop.currentOs)
+    }
+}
+
+compose.desktop {
+    application {
+        mainClass = "MainKt"
+
+        nativeDistributions {
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            packageName = "ch.dissem.yaep"
+            packageVersion = "1.0.0"
+
+            buildTypes.release.proguard {
+                configurationFiles.from(project.file("proguard-rules.pro"))
+                isEnabled.set(true)
+                obfuscate.set(true)
+            }
+        }
+    }
+}