add genRunConfigs task, add property for easier game jar discovery in dev

src/main/kotlin/org/ecorous/esnesnon/gradle/NonsenseGradlePlugin.kt

@@ -1,6 +1,7 @@
 package org.ecorous.esnesnon.gradle
 
 import net.fabricmc.fernflower.api.IFabricJavadocProvider
+import org.ecorous.esnesnon.gradle.run.RunConfigGenerator
 import org.ecorous.esnesnon.gradle.vineflower.ParchmentJavadocProvider
 import org.ecorous.esnesnon.nonsense_remapper.provider.ParchmentProvider
 import org.gradle.api.Plugin
@@ -90,6 +91,13 @@ class NonsenseGradlePlugin : Plugin<Project> {
             }
         }
 
+        project.task("genRunConfigs").apply {
+            doFirst {
+                group = "nonsense"
+                RunConfigGenerator.generate(project)
+            }
+        }
+
         // TODO mod relocation/renaming: decide on mod file extension
         /*project.tasks.getByName("jar").actions.addLast {
             it.outputs.files.forEach {file ->

src/main/kotlin/org/ecorous/esnesnon/gradle/run/RunConfigGenerator.kt

@@ -44,7 +44,11 @@ object RunConfigGenerator {
                     project,
                     "Minecraft ${env.pascalName}",
                     "org.ecorous.esnesnon.nonsense.loader.impl.launch.client.Nonsense${env.pascalName}",
-                    arrayOf("-Dnonsense.development=true", "-Dlog4j.configurationFile=$assetPath"),
+                    arrayOf(
+                        "-Dnonsense.development=true",
+                        "-Dnonsense.plugin.minecraft.gameJar=${NonsenseGradlePlugin.remappedGameJarPath}",
+                        "-Dlog4j.configurationFile=$assetPath"
+                    ),
                     arrayOf(
                         "--assetDir", assetPath.toString(),
                         "--version", "Nonsense",