Gradle generates packaged_files.txt

Fixes #188

Author: joshuaskelly

.gitignore

@@ -13,6 +13,7 @@
 
 save/
 Dungeoneer/save/
+Dungeoneer/assets/packaged_files.txt
 DungeoneerDesktop/save
 
 *.iml

Dungeoneer/assets/packaged_files.txt

@@ -5,6 +5,19 @@ sourceCompatibility = 1.8
 
 sourceSets.main.java.srcDirs = [ "src/" ]
 
+task packageFiles {
+    def text = "# Auto-generated file created by 'gradle Dungeoneer:build'\n" +
+            "# used to let the game list directories for packaged files\n" +
+            "./\n"
+
+    fileTree(dir: "./assets", exclude: "save").visit { FileVisitDetails details ->
+        text += "./" + details.relativePath.toString().replace("\\\\", "/") + "\n"
+    }
+
+    def file = file("./assets/packaged_files.txt")
+    file.text = text
+}
+
 eclipse.project {
     name = appName + "-core"
 }