plugin-development: Support specifying guice module

plugin-development/src/main/java/org/spongepowered/gradle/plugin/config/PluginConfiguration.java

@@ -85,4 +85,8 @@ public void description(final String description) {
         this.description.set(description);
     }
 
+    public void guiceModule(final String guiceModule) {
+        this.property("guice-module", guiceModule);
+    }
+
 }

plugin-development/src/main/java/org/spongepowered/gradle/plugin/config/PluginInheritableConfiguration.java

@@ -33,6 +33,8 @@
 import org.gradle.api.tasks.Optional;
 
 import javax.inject.Inject;
+import java.util.HashMap;
+import java.util.Map;
 
 public abstract class PluginInheritableConfiguration {
 
@@ -46,6 +48,8 @@ public abstract class PluginInheritableConfiguration {
 
     private final NamedDomainObjectContainer<PluginDependencyConfiguration> dependencies;
 
+    private final Map<String, Object> properties;
+
 
     @Inject
     public PluginInheritableConfiguration(final ObjectFactory objects) {
@@ -55,6 +59,7 @@ public PluginInheritableConfiguration(final ObjectFactory objects) {
 
         this.contributors = objects.domainObjectContainer(PluginContributorConfiguration.class);
         this.dependencies = objects.domainObjectContainer(PluginDependencyConfiguration.class);
+        this.properties = new HashMap<>();
     }
 
     @Input
@@ -110,4 +115,13 @@ public void dependencies(final Action<? super NamedDomainObjectContainer<PluginD
     public void dependency(final String name, final Action<? super PluginDependencyConfiguration> action) {
         this.dependencies.register(name, action);
     }
+
+    @Nested
+    public Map<String, Object> getProperties() {
+        return this.properties;
+    }
+
+    public void property(final String key, final Object value) {
+        this.properties.put(key, value);
+    }
 }

plugin-development/src/main/java/org/spongepowered/gradle/plugin/task/WritePluginMetadataTask.java

@@ -174,6 +174,8 @@ private <T extends StandardInheritable.AbstractBuilder<?, T>> T populateBuilder(
 
             builder.addDependency(dependencyBuilder.build());
         }
+
+        builder.properties(src.getProperties());
         return builder;
     }
 }