Deprecate JavaScript coremod system

Author: LexManos

README.md

@@ -2,6 +2,3 @@
 
 Service providers, and other global API-like elements,
 separated so dependencies don't need to be on the core forge system.
-
-* ```net.minecraftforge.forgespi.ICoreMod*``` are interfaces for communication between
-Forge and the coremod library.

src/main/java/net/minecraftforge/forgespi/coremod/ICoreModFile.java

@@ -10,7 +10,16 @@
 /**
  * Interface for core mods to discover content and properties
  * of their location and context to the coremod implementation.
+ *
+ * @deprecated The JS coremod system was an experiment to force modders
+ * to stop shipping both transformer and game layer code in the same jar.
+ * JavaScript was chosen because it was included in Java itself and could
+ * easily be decoupled from the game layer data.
+ *
+ * Java has stopped shipping JavaScript, and most Transformers are Mixin
+ * these days, so it's no longer needed.
  */
+@Deprecated(forRemoval = true, since = "7.1.6")
 public interface ICoreModFile {
     String getOwnerId();
     Reader readCoreMod() throws IOException;

src/main/java/net/minecraftforge/forgespi/coremod/ICoreModProvider.java

@@ -12,7 +12,16 @@
  * Core Mod Provider - core mod logic is implemented
  * in a separate library. Connection is provided here
  *
+ * @deprecated The JS coremod system was an experiment to force modders
+ * to stop shipping both transformer and game layer code in the same jar.
+ * JavaScript was chosen because it was included in Java itself and could
+ * easily be decoupled from the game layer data.
+ *
+ * Java has stopped shipping JavaScript, and most Transformers are Mixin
+ * these days, so it's no longer needed.
+ *
  */
+@Deprecated(forRemoval = true, since = "7.1.6")
 public interface ICoreModProvider {
     /**
      * Add a coremod file to the list of coremods