Move Forge Access Transformers to a boolean toggle.

Also added additional information about why the path to the AT file can not be easily changed.

Forge/build.gradle

@@ -20,7 +20,13 @@ java.toolchain.languageVersion = JavaLanguageVersion.of(16)
 
 minecraft {
     mappings channel: 'official', version: minecraft_version
-    // accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg') // Currently, this location cannot be changed from the default.
+    
+    if (project.hasProperty('forge_ats_enabled') && project.findProperty('forge_ats_enabled').toBoolean()) {
+        // This location is hardcoded in Forge and can not be changed.
+        // https://github.com/MinecraftForge/MinecraftForge/blob/be1698bb1554f9c8fa2f58e32b9ab70bc4385e60/fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModFile.java#L123
+        accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')
+        project.logger.debug('Forge Access Transformers are enabled for this project.')
+    }
 
     runs {
         client {

gradle.properties

@@ -3,6 +3,7 @@ minecraft_version=1.17.1
 
 # Forge
 forge_version=37.0.70
+//forge_ats_enabled=true
 
 # Fabric
 fabric_version=0.40.1+1.17