add: allow installing OptiFine 1.14.4 and Forge in same game version

HMCLTransformerDiscoveryService/bin/main/META-INF/services/cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService

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+org.jackhuang.hmcl.HMCLTransformerDiscoveryService

HMCLTransformerDiscoveryService/build.gradle

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+version '1.0'
+
+dependencies {
+    compileOnly project.files("lib/modlauncher-4.1.0.jar")
+}
+
+jar {
+    manifest {
+        attributes 'Created-By': 'Copyright(c) 2013-2020 huangyuhui.',
+                'Implementation-Version': version
+    }
+}

HMCLTransformerDiscoveryService/src/main/java/org/jackhuang/hmcl/HMCLTransformerDiscoveryService.java

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+/*
+ * Hello Minecraft! Launcher
+ * Copyright (C) 2020  huangyuhui <huanghongxun2008@126.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.jackhuang.hmcl;
+
+import cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService;
+
+import java.io.File;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class HMCLTransformerDiscoveryService implements ITransformerDiscoveryService {
+    private static final String CANDIDATES = System.getProperty("hmcl.transformer.candidates");
+
+    @Override
+    public List<Path> candidates(Path gameDirectory) {
+        return Arrays.stream(CANDIDATES.split(File.pathSeparator))
+                .flatMap(path -> {
+                    try {
+                        return Stream.of(Paths.get(path));
+                    } catch (InvalidPathException e) {
+                        return Stream.of();
+                    }
+                }).collect(Collectors.toList());
+    }
+}

HMCLTransformerDiscoveryService/src/main/resources/META-INF/services/cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService

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+org.jackhuang.hmcl.HMCLTransformerDiscoveryService