Set ToolExec base properties using #set instead of #convention

The conventions of these properties can be easily overridden by other
plugins such as the base 'java' plugin, where it sets the convention of
the JavaLauncher to be the project toolchain. This caused issues with
projects that required toolchain language version 8.

Author: Jonathing

build.gradle

@@ -9,8 +9,8 @@ plugins {
     id 'eclipse'
     id 'maven-publish'
     id 'io.freefair.javadoc-links'
-    alias libs.plugins.licenser
     id 'net.minecraftforge.gradleutils'
+    alias libs.plugins.licenser
     alias libs.plugins.gitversion
     alias libs.plugins.changelog
     alias libs.plugins.plugin.publish
@@ -49,7 +49,6 @@ configurations {
         }
     }
 
-    named('apiElements', applyGradleVersionAttribute)
     named('runtimeElements', applyGradleVersionAttribute)
     named('shadowRuntimeElements', applyGradleVersionAttribute)
 }

settings.gradle

@@ -22,7 +22,7 @@ plugins {
 
     // https://plugins.gradle.org/plugin/net.minecraftforge.gradleutils
     // Gradle utilities for Minecraft Forge projects.
-    id 'net.minecraftforge.gradleutils' version '3.0.0-beta.10'
+    id 'net.minecraftforge.gradleutils' version '3.0.0-beta.13'
 }
 
 // Known bug with Groovy DSL in IntelliJ, it's never getting fixed

src/main/groovy/net/minecraftforge/gradleutils/GradleUtilsExtensionInternal.java

@@ -9,8 +9,6 @@
 import org.gradle.api.reflect.HasPublicType;
 import org.gradle.api.reflect.TypeOf;
 
-import java.util.Objects;
-
 non-sealed interface GradleUtilsExtensionInternal extends GradleUtilsExtension, HasPublicType {
     @Override
     default TypeOf<?> getPublicType() {

src/main/groovy/net/minecraftforge/gradleutils/shared/ToolExecBase.java

@@ -69,8 +69,8 @@ protected ToolExecBase(Class<P> problemsType, Tool tool) {
         this.defaultToolDir.disallowChanges();
         this.defaultToolDir.finalizeValueOnRead();
 
-        this.getMainClass().convention(Objects.requireNonNull(tool.getMainClass(), "Tool must have a main class"));
-        this.getJavaLauncher().convention(SharedUtil.launcherForStrictly(this.getJavaToolchainService(), tool.getJavaVersion()));
+        this.getMainClass().set(Objects.requireNonNull(tool.getMainClass(), "Tool must have a main class"));
+        this.getJavaLauncher().set(SharedUtil.launcherForStrictly(this.getJavaToolchainService(), tool.getJavaVersion()));
     }
 
     /// The enhanced problems instance to use for this task.