Additions to the mdk build.gradle to accommodate datagens. (#7398)

mdk/build.gradle

@@ -75,7 +75,8 @@ minecraft {
             // Recommended logging level for the console
             property 'forge.logging.console.level', 'debug'
 
-            args '--mod', 'examplemod', '--all', '--output', file('src/generated/resources/')
+            // Specify the modid for data generation, where to output the resulting resource, and where to look for existing resources.
+            args '--mod', 'examplemod', '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')
 
             mods {
                 examplemod {
@@ -86,6 +87,9 @@ minecraft {
     }
 }
 
+// Include resources generated by data generators.
+sourceSets.main.resources { srcDir 'src/generated/resources' }
+
 dependencies {
     // Specify the version of Minecraft to use, If this is any group other then 'net.minecraft' it is assumed
     // that the dep is a ForgeGradle 'patcher' dependency. And it's patches will be applied.