Bump CoreMods to 5.2 (#10130)

Full Changelog:
https://gist.github.com/Jonathing/c3ad28b2a048ac839a7baba5417ee870

The key features are:
- ES6 language support
- Thoroughly updated ASMAPI, with full documentation
- Bug fixes (some optional for backwards-compatibility)
- Partial internal code cleanup
- Request CoreMods to not apply fix for ASMAPI.findFirstInstructionBefore by default
- Updated ASM to 9.7.1
- Updated Nashorn to 15.4

build.gradle

@@ -27,6 +27,7 @@ plugins {
     id 'com.github.ben-manes.versions' version '0.46.0'
     id 'net.minecraftforge.gradleutils' version '[2.2,2.3)'
     id 'eclipse'
+    id 'idea'
     id 'de.undercouch.download' version '5.4.0'
     id 'net.minecraftforge.gradle.patcher' version '[6.0.11,6.2)' apply false
     id 'net.minecraftforge.gradle.mcp' version '[6.0.11,6.2)' apply false
@@ -53,12 +54,12 @@ ext {
     SPI_VERSION = '7.0.1'
     MERGETOOL_VERSION = '1.1.5'
     ACCESSTRANSFORMERS_VERSION = '8.0.4'
-    COREMODS_VERSION = '5.1.6'
+    COREMODS_VERSION = '5.2.1'
     EVENTBUS_VERSION = '6.0.5'
     MODLAUNCHER_VERSION = '10.0.9'
     SECUREJARHANDLER_VERSION = '2.1.10'
     BOOTSTRAPLAUNCHER_VERSION = '1.1.2'
-    ASM_VERSION = '9.7'
+    ASM_VERSION = '9.7.1'
     INSTALLER_VERSION = '2.2.+'
     MIXIN_VERSION = '0.8.5'
     TERMINALCONSOLEAPPENDER_VERSION = '1.2.0'
@@ -302,7 +303,7 @@ def sharedDeps = {
     installer "org.jline:jline-reader:${JLINE_VERSION}"   // Dep of TerminalConsoleAppender
     installer "org.jline:jline-terminal:${JLINE_VERSION}" // Dep of TerminalConsoleAppender
     installer "org.spongepowered:mixin:${MIXIN_VERSION}"
-    installer 'org.openjdk.nashorn:nashorn-core:15.3'
+    installer 'org.openjdk.nashorn:nashorn-core:15.4'
     installer "net.minecraftforge:JarJarSelector:${JARJAR_VERSION}"
     installer "net.minecraftforge:JarJarMetadata:${JARJAR_VERSION}"
 
@@ -1820,3 +1821,11 @@ if (System.env.TEAMCITY_VERSION) {
         }
     }
 }
+
+idea {
+    module {
+        // IntelliJ IDEA does not do this by itself anymore...
+        downloadJavadoc = true
+        downloadSources = true
+    }
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/FMLLoader.java

@@ -65,6 +65,9 @@ public class FMLLoader
             throw new IncompatibleEnvironmentException("Incompatible modlauncher found "+modLauncherPackage.getSpecificationVersion());
         }
 
+        // Allows us to communicate properties with other services through ModLauncher
+        setupBlackboardKeys();
+
         accessTransformer = (AccessTransformerService) environment.findLaunchPlugin("accesstransformer").orElseThrow(()-> {
             LOGGER.error(CORE, "Access Transformer library is missing, we need this to run");
             return new IncompatibleEnvironmentException("Missing AccessTransformer, cannot run");
@@ -126,6 +129,12 @@ public class FMLLoader
         }
     }
 
+    private static void setupBlackboardKeys() {
+        LOGGER.debug(CORE, "Requesting CoreMods to not apply the fix for ASMAPI.findFirstInstructionBefore by default");
+        var blackboardKey = TypesafeMap.Key.getOrCreate(Launcher.INSTANCE.blackboard(), "coremods.use_old_findFirstInstructionBefore", Boolean.class);
+        Launcher.INSTANCE.blackboard().<Boolean>computeIfAbsent(blackboardKey, k -> true);
+    }
+
     static void setupLaunchHandler(final IEnvironment environment, final Map<String, Object> arguments)
     {
         final String launchTarget = environment.getProperty(IEnvironment.Keys.LAUNCHTARGET.get()).orElse("MISSING");